disclaimer: tags/genres grabbed from aniDB and/or ANN. I haven't watched the anime myself yet.
comedy action romance sci-fi school life drama fantasy adventure ecchi short episodes sequel
Ultraman
Decades ago, a being known as the Giant of Light joined Hayata Shin of the Scientific Special Search Party to save Earth from an invasion of terrifying monsters known as Kaiju. Now, many years later, those dark days are fading into memory, and the world is at peace. But in the shadows a new threat is growing, a danger that can only be faced by a new kind of hero - a new kind of Ultraman... Shinjirou is an ordinary teenager, but his father is the legendary Hayata Shin. When he learns that his father passed on the "Ultraman Factor" to him, and that he possesses incredible powers, nothing will ever be the same again.
sci-fi, 3dcg
Kono Yo no Hate de Koi wo Utau Shoujo YU-NO
Arima Takuya is a young student whose father, a historian who has conducted various researches, disappeared recently. During a summer vacation Takuya receives a peculiar package from his missing father, along with a letter containing information about the existence of various parallel worlds. At first Takuya doesn’t take it seriously, but soon he realizes that he possesses a device that allows him to travel to alternate dimensions. Is his father alive, after all? If so, where is he?
drama, sci-fi
Neko no Nyahho
Vincent van Meowogh is a cat painter who lives in a mansion in Paris surrounded by his quirky friends.
[for kids]
Yatogame-chan Kansatsu Nikki
After growing up in Tokyo, high school student Jin Kaito moves to Nagoya where he meets Yatogame Monaka, a fellow student who puts her Nagoya dialect on full display. With her cat-like appearance and unvarnished Nagoya dialect, Yatogame won’t open up to him at all. This popular local comedy is increasing the status of Nagoya through observation of the adorable Yatogame-chan!
comedy, [short 5min]
Fruits Basket
After a family tragedy turns her life upside down, plucky high schooler Tohru Honda takes matters into her own hands and moves out into a tent. Unfortunately for her, she pitches her new home on private land belonging to the mysterious Sohma clan, and it isn’t long before the owners discover her secret. But, as Tohru quickly finds out when the family offers to take her in, the Sohmas have a secret of their own--when touched by the opposite sex, they turn into the animals of the Chinese Zodiac.
comedy, drama, romance, supernatural, [remake]
Senryuu Shoujo
Yukishiro Nanako is a cute, cheerful high school girl with one peculiar trait - instead of verbal communication, she writes senryu (a type of haiku) poems to relay her thoughts. Together with ex-delinquent Busujima Eiji, they are budding freshmen of the school’s Literature Club. Even though Nanako doesn’t talk, with the power of senryu, the adorable pair has no problem enjoying their fun school-life through the tune of 5-7-5 syllables.
comedy, [short 15min]
Midara na Ao-chan wa Benkyou ga Dekinai/Ao-chan Can't Enjoy Her Youth
When Ao was in kindergarten, she smiled ear-to-ear as she told her classmates how her father (a bestselling erotic author) chose her name: "A as in apple and O as in orgy!" That day still haunts her ten years later as she studies with a single goal in mind: get into an elite university and achieve independence from her father once and for all. She has no youth to misspend and no time to think about boys ... until her classmate, "King Normie" Kijima, approaches her with a shocking confession of love. She tries to lose Kijima, but he just can’t take a hint ... and as her mind runs wild with impure thoughts, she realizes her father has totally influenced her!
comedy, romance, [short 15min]
Hitoribocchi no Marumaru Seikatsu
In order to reconcile with her childhood friend, a very shy girl aims to befriend everyone in her class.
comedy
Kedama no Gonjirou

[for kids?]
Mix - Meisei Story
Thirty years after Uesugi Tatsuya and Kazuya brought Meisei High School to their only appearance and championship at the National High School Baseball Championship, a pair of highly talented stepbrothers, Tachibana Touma and Souichirou, bring the possibility of a return to the Koshien, as they learn of the Meisei High sports heritage of their fathers.
sports, [sequel/spinoff to Touch]
Chou Kadou Girl 1/6 - Amazing Stranger
Bouida Haruto, a hardcore otaku with no interest in 3D (real) women, once appreciated figures from afar, accepting that "if you get into them, there’s no turning back." However, when Nona, a character he loved from an anime called "Girls - Planetary Investigation" had a figure of her released, he ended up purchasing it. And then that night, the figure of Nona somehow came to life, and a couple-like lifestyle between man and toy began.
comedy, [short 15min]
Joshikausei
Who needs dialog when you’re this cute? The beautiful (but unlucky) Momoko, the cool, collected Shibumi, and the refreshingly innocent Mayumi star in a "silent manga." No speeches, no dialog! Just pictures, sound effects, and three high school girls living their daily lives.
comedy, [short 5min]
Nobunaga-sensei no Osanazuma
Nobunaga is a middle school teacher who constantly dreams of an adoring beautiful girl appearing in front of him. One day, Kichou, the 14-year-old wife of the real-life Sengoku (Warring States) period warlord Oda Nobunaga, does appear in front of him after having apparently traveled through time. She mistakes the present-day Nobunaga for the historical Oda Nobunaga, and tries to get him to get her pregnant.
comedy, romance, time travel, [short 10min]
Demon Slayer - Kimetsu no Yaiba
Since ancient times, rumors have abounded of man-eating demons lurking in the woods. Because of this, the local townsfolk never venture outside at night. Legend has it that a demon slayer also roams the night, hunting down these bloodthirsty demons. For young Tanjirou, these rumors will soon to become his harsh reality... Ever since the death of his father, Tanjirou has taken it upon himself to support his family. Although their lives may be hardened by tragedy, they’ve found happiness. But that ephemeral warmth is shattered one day when Tanjirou finds is family slaughtered and the lone survivor, his sister Nezuko, turned into a demon. To his surprise, however, Nezuko still shows signs of human emotion and thought... Thus begins Tanjirou’s request to fight demons and turn his sister human again.
action, fantasy, supernatural
Bokutachi wa Benkyou ga Dekinai/We Never Learn
Yuiga Nariyuki tutors three genius of different subjects in highschool to get a scholarship. Furuhashi Fumino is a genius on literature but horrible in math, Ogata Rizu is a genius on mathematics and science but literature and arts are terrible subjects for her and Takemoto Uruka is a genius in the athletic field but really bad in all the others. Together, they study very hard and want to get better at their worst subjects while Fumino and Ogata wants to go to college and work on these subjects for life.
comedy, romance, school life, harem
Kono Oto Tomare!
Since the graduation of the senior members of the club, Takezou ends up being the sole member of the "Koto" (traditional Japanese string instrument) club. Now that the new school year has begun, Takezou will have to seek out new members into the club, or the club will become terminated. Out of nowhere, a new member barges into the near-abandoned club room, demanding to join the club. How will Takezou be able to keep his club alive and deal with this rascal of a new member?
clubs
Gunjou no Magmell
A new continent named Magmell suddenly appears in the ocean, and a new age of exploration begins. Explorers venture to the island to find previously unknown lifeforms and resources, but experience one disaster after another. You and his colleagues make a living as relief workers who aid the explorers.
fantasy
Shoumetsu Toshi
In one day a town is annihilated. Yuki is a young woman who is said to be the only person left alive from the town after the annihilation, and Takuya is a loner and a smuggler. Together, with the letter left by Yuki’s father, they go toward the town, now called Lost, but unexpected obstacles stand in their path. The thoughts of those left behind, secret and mysterious organizations, and hidden conspiracies await Yuki and Takuya as they move closer toward the mystery behind Lost.
action, aventure, drama, fantasy, mystery
Araiya-san! Ore to Aitsu ga Onnayu de!?
Souta Tsukishima begins working at his family’s public bathhouse as a back washer. While concealing her true identity, Souta’s classmate Aoi Yuzuki visits the bathhouse. A relationship between the two begins to develop when Souta washes Aoi’s back.
[short], [ecchi TV ver - H web ver]
Fairy Gone
In a world where fairies possess and reside within animals, granting them special powers. By surgically removing and transplanting the organs of a possessed animal into a human, humans can partially summon the fairy and use them as weapons. Eventually, such individuals were used for war, and were called "Fairy Soldiers." After a long war, these soldiers lost their purpose, and had to reintegrate into society. From the government, to the mafia, and even becoming terrorists, each tread their own path. The story begins nine years after the end of the war, and centers on the protagonist Maria. Maria is a fresh recruit of "Dorothea," an organization dedicated to the investigation and suppression of fairy-related crimes and incidents. Even in peacetime, the government is still unstable after the war. Many criminals still have lingering wounds from the previous conflict, and there are terrorist groups bent on revenge. This is the story of Fairy Soldiers seeking their own justice in a chaotic postwar world.
action, demons, magic
Mayonaka no Occult Koumuin/Midnight Occult Civil Servants
Arata Miyako is a new government worker assigned to the Shinjuku Ward Office’s "Nighttime Regional Relations" department. Each of Tokyo’s 23 wards has one such department, which were established to solve paranormal and occult-related events. Arata can understand non-human speech that no one else understands, and he encounters a youkai (supernatural entity) at Shinjuku Gyoen park that calls him Abe no Seimei - the name of a historical Japanese occultist and diviner.
fantasy, mystery, supernatural
Nande Koko ni Sensei ga!?
High school student Ichirou’s female teacher Kojima-sensei is famous for being a "demon teacher." However, in front of Ichirou she seems to be air-headed and clumsy, and he keeps finding himself in perverted situations with her in places like the men’s bathroom, in the men’s bathhouse, in the pool, at the school infirmary, and elsewhere.
comedy, ecchi, [short 15min]
Hachigatsu no Cinderella Nine
When Arihara Tsubasa enters Rigahama Municipal High School and learns that it has no baseball club, she starts up the Girls’ Baseball Club on her own. Drawn to the club are girls who have never played baseball before, girls who once played it but quit, and girls who are constantly tackling great challenges. The Rigahama Girls’ Baseball Club races through the trials of youth, periodically clashing and quarreling, but supporting each other all the way! And so begins the hottest summer the world has ever known...
sports
Jimoto ga Japan/I'm From Japan
Abiko Tokio is a transfer student from Yamagata prefecture. He’s rough, he’s tough and he wants to beat up the strongest kid in school and earn the respect that he and Yamagata prefecture deserve! But he soon makes an unlikely friend who accepts everyone no matter where they’re from - and his name is Japan!
comedy, [short]
Namu Amida Butsu! - Rendai Utena
The Thirteen Buddha, along with Taishakuten and Bonten, must confront the evil Maara. Maara seeks revenge against Shaka Nyorai, who had previously saved the world from suffering and conflict by achieving enlightenment.
fantasy, historical
RobiHachi
In Neo Tokyo in the year G.C.0051, humans have known of aliens for the last 50 years and obtained super light-speed navigation technology and formed a commonwealth of planets. Self-proclaimed freelance reportage writer Robby Yarge fails at work, so his contract is cut. His girlfriend leaves him, he nearly dies in a traffic accident, and debt collectors are after him. One day, a bag snatcher steals Robby’s bag, and a young man helps him. Hatchi Kita, an 18-year-old part-time worker, catches the criminal and returns Robby’s bag. However, Hatchi turns up again in Robby’s life as a debt collector. Hatchi explains that it’s his part-time job working for the loan shark Yang. A cat-and-mouse chase begins, and Yang takes his subordinates Allo and Gras along for the ride.
sci-fi
Sewayaki Kitsune no Senko-san
Nakano is an employee of an exploitative "black" company, who meets a divine fox spirit named Senko. While she looks like a young girl, Senko is in fact 800 years old. She offers to spoil Nakano as much as possible, and begins looking after him.
comedy, romance, supernatural
Kenja no Mago/Wise Man's Grandchild
A powerful wizard and sage comes upon a baby whom he adopts and names Shin. The baby is actually a man from our world reincarnated into the sage’s world. The sage raises Shin, separated from the rest of society, and teaches him in the ways of magic. It is only when Shin turns 15 years old and sets out on his own journey that the sage remembers that he forgot to teach Shin the common sense and ways of this particular world. And so, Shin goes the capital of the Alsheid Kingdom to enroll in the capital’s magic academy.
action, comedy, fantasy, magic
Carole & Tuesday
Fifty years have passed since mankind began migrating to the new frontier: Mars. It’s an age where most culture is produced by AI, and people are content to be passive consumers. There’s a girl. Scrapping a living in the metropolis of Alba City, she’s working part time while trying to become a musician. She’s always felt like something is missing. Her name is Carole. There’s a girl. Born to a wealthy family in the provincial town of Herschel City, she dreams of becoming a musician, but nobody around her understands. She feels like the loneliest person in the world. Her name is Tuesday. A chance meeting brings them together. They want to sing. They want to make music. Together, they feel like they just might have a chance. The two of them may only create a tiny wave. But that wave will eventually grow into something larger...
drama, music, romance, sci-fi
B Rappers Street

[short]
Sarazanmai
One day, three second-year middle school students - Kazuki Yasaka, Toi Kuji, and Enta Jinai - meet a kappa-like creature named Keppi, who is the self-proclaimed heir to the throne of Kappa Kingdom. Keppi forcibly takes the students’ shirikodama (a mythical organ kappa steal through a person’s anus) and they are transformed into kappa. Keppi informs them, "If you want to return to your former selves, you need to connect in ’that way’ and you must bring me the shirikodama of zombies." At the same time, two policemen, Reo Niiboshi and Mabu Akutsu, try to do something at the police box where they are stationed.
action, fantasy, supernatural
Rilakkuma to Kaoru-san
Rilakkuma suddenly appears in the apartment of office worker Kaoru and begins living there, spending every day idling around. He has a zipper on his back, but the contents remain unknown. He likes food like pancakes, omelette rice, pudding, and dango. He lives together with the little white cub Korilakkuma and Kaoru’s pet Kiiroitori
[after 1st eps], comedy, slice of life, [stop-motion]
Bakugan - Battle Planet

[spinoff?]
Dia no Ace - Act II

[sequel]
Shounen Ashibe - Go! Go! Goma-chan 4

[sequel], [short]
Cinderella Girls Gekijou - Climax Season

[sequel], [short]
One Punch Man 2

[sequel]
Neko Neko Nihonshi (2019)

[sequel]
Aikatsu Friends! - Kagayaki no Jewel

[sequel]
Hangyakusei Million Arthur 2

[sequel]
Bakumatsu Crisis

[sequel]
Youkai Watch!

[sequel]
Hora, Mimi ga Mieteru yo!

[sequel]
Duel Masters!!

[sequel]
King of Prism - Shiny Seven Stars

[spinoff], [split up movies]
Isekai Quartet

[crossover/4x spinoff], parody, [short 15min]
Strike Witches - 501-butai Hasshin Shimasu!

[spinoff], [short 15min]
Bungou Stray Dogs 3

[sequel]
Shingeki no Kyojin/Attack on Titan 3 Part 2

[sequel]
Cardfight!! Vanguard - Zoku Koukousei-hen

[sequel]