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
Chou Shounen Tanteidan NEO
Tokyo, year 2117. Boy detective Yoshio Kobayashi the 7th wants to help protecting the peaceful life from unknown threats, particularly those from hidden, mysterious criminal organizations. Things usually don’t progress as he has expected, though.
comedy, [short 4min]
Akiba's Trip - The Animation
There is a danger lurking in the Otaku heaven of Akihabara. Vampires with an ability to take over anyone they bite seek their prey in this anime fan’s paradise. When Denkigai Tamotsu encounters one, he nearly loses his life until the mysterious Mayonaka Matome revives him! Now part vampire, he forms a group to protect the streets of Akiba.
ecchi
Masamune-kun no Revenge
Masamune Makabe was mercilessly teased for being overweight as child, especially by a girl named Aki Adagaki. Masamune decides to get his sweet revenge by transforming himself into an attractive, intelligent, and athletic young man. After many years honing his new persona, he transfers to Aki’s school in hopes of finally getting his long-awaited vengeance.
comedy, romance
Urara Meirochou
Meiro-chou is a town where all-female diviners (uranaishi) live and where girls from all over the country yearn to become the top diviner . Urara. Today, a solitary girl named Chiya enters the town’s gates. However, she has another purpose coming here, besides becoming the Urara. Chiya’s days as an apprentice diviner begin as she meets three friends . the earnest Kon, Koume who is a fan of Western culture, and the shy Nono.
comedy, supernatural
Seiren
Shoichi Kamita is an ordinary high school boy, who is faced with the university entrance exam and worried about his future. This campus romantic comedy, "Seiren", which means honest in Japanese, depicts his pure relationship with three different heroines. Each story is the unique and mutual memory between him and the heroine.
comedy, school life, romance, [sequel-ish?]
Forest Fairy Five
A beautiful nation, prospering since ancient times, Japan is now known as the Anime Kingdom. There are more than just humans living there; animes truly do exist in Japan. Past the Fairy Ring, to the world of fairies, live anime-chans. There’s a Fairy Ring in your town, too. Here. And there. Even in Harajuku. Maybe even in the Ashigara mountains. By some chance, we’ll open that door. And we might get to meet the anime-chans. This is the land where you get to meet anime-chans.
[short 10min]
Fuuka
Yuu Haruna is the new boy in town and finds himself drawn to Fuuka. He discovers that they both have love for the same band and Yuu, who isn’t too bad on bass, compliments Fuuka’s raw singing voice. They decide to form a band together. Yuu wants to confess his growing feelings for Fuuka but his childhood friend and idol Koyuki still harbors feelings for Yuu.
drama, romance, music
Youjo Senki/Saga of Tanya the Evil
Tanya Degurechov used to be one of Japan’s elite office workers, but because of a wrathful god, was reborn as a little girl. She has blonde hair, blue eyes, and nearly transparent white skin, and she flies through the air and mercilessly strikes down her opponents. She speaks with a young girl’s lisp and commands the army. Tanya prioritizes optimization and career advancement above all, and she will become the most dangerous entity among the Imperial Army’s sorcerers.
action, military
Minami Kamakura Koukou Joshi Jitensha-bu
Maiharu Hiromi has moved from Nagasaki to Kamakura. She begins her new life in Kamakura and her first day in high school by bicycling to her school, but she has not ridden a bicycle for years. On the way to the first day ceremony she meets Akitsuki Tomoe, and Tomoe helps her train to be better at bicycling.
cycling, sports
Schoolgirl Strikers Animation Channel
Goryoukan Academy is a new private senior/junior high school for girls with a vast downtown campus. This highly popular school has "another face" - a secret hidden side. It organizes and trains the special unit Fifth Force to protect the world from invisible supernatural entities known as "Oburi" that are devouring the world. A team of five trained with powers against the Oburi is to be chosen from the student body to perform missions. A new team leader has been appointed to assemble the five students.
action, school life
Spiritpact
Heir of an old famous family of Exorcist, You Keika is stricken by poverty after losing his parents and he had to struggle as a street fortune teller and as a computer recovery part timer to earn money. One night in a junkyard, he met the mysterious yet charismatic Exorcist, Tanmoku Ki who was fighting an evil spirit. This encounter was the beginning of a fated story for You Keika. Unfortunately for him, he was hit by a car and became a ghost. That’s where, the handsome exorcist Tanmoku Ki appeared and asked You Keika to make a pact with him to fight Evil Spirits together. Here starts the friendship of our heroes!
action, supernatural
Demi-chan wa Kataritai
Tetsuo Takahashi is a teacher working at Shibasaki High School and specializing in the physiological studies of demi-humans. His students include Akira Takanashi, a vampire and lover of tomato juice; Kyouko Machi, a dullahan; and Yuki Kusakabe, a yuki-onna. The school also employs math teacher Sakie Satou, a succubus.
comedy, supernatural
Chain Chronicle - Hekuseitasu no Hikari
This is the story of the Chain Chronicle, a book that describes everything that happens in the world. The citizens of the remote continent of Yggd once thought that there was nothing beyond their continent. The continent was divided into several regions, each with its own king. Though there were small skirmishes amongst them, a lord, chosen by the kings in conference, always maintained balance, until the evil Black Army arrived. The Volunteer Army, led by Yuri, was no match for the Black Army. During the fighting, the Lord of Black captures half of the Chain Chronicle, as well as the capital.
adventure, fantasy
elDLIVE
"Mumbling" Chuta Kokonose doesn’t have many friends. In fact, the only conversations he has anymore are with voices inside his head. Little does he know that this voice doesn’t mean he’s crazy. It just means he has an alien living inside his body.
sci-fi, aliens
Nyanko Days
Konagai Yuuko is a first-year in high school and a shy girl. Tomoko owns three cats. The cheerful and live Munchkin Maa, the smart and responsible Russian Blue Rou, and the gentle crybaby Singapura Shii. Tomoko, whose only friends were her cats, one day becomes friends with Shiratori Azumi, who also loves cats. This is a fluffy and cute comedy about the daily life of Tomoko and her cats, Tomoko and Azumi’s friendship, and the interaction between cats.
comedy, [short 3min]
Idol Jihen
The story takes place in Japan where the economy is in tatters and the distrust of politicians is at a record high. An idol named Mikazuki Kagura who has the support of the Japanese people steps in, establishes a new government and gives positions of government administration to idols, which results in a quick recovery for the Japanese economy. More than 20 years later, Kagura is still leading Japan’s idol government, but she suddenly decides to retire from the political world. The 47 idols who serve as Diet members must now vie to become the next Prime Minister.
idols
Little Witch Academia (TV)
Akko Kagari is an ordinary girl who joins the renowned witch academy for witch girls, Luna Nova Academy. When she was younger, she went to Magical Festa, a magic show hosted by a witch named Shiny Chariot. Akko was so mesmerized and inspired by Shiny Chariot’s performance that she dreamed to someday be a "cool" witch like her. This young and impressionable Akko takes Shiny Chariot’s words as her own motto: "Never forget, a believing heart is your magic.. As part of a class, Akko and her classmates go into a labyrinth under the Tower of Luna Nova. There, a sealed ancient dragon was unleashed by one of her classmates. Akko tries to stop the dragon, but...
magic
Gabriel DropOut
Gabriel White graduated at the top of the class at angel school and attends a human school on earth in pursuit of knowledge, but then gets engrossed in a web game and decides its too much trouble to go anywhere.
comedy, angels, demons
Sentai Hero Sukiyaki Force - Gunma no Heiwa o Negau Season
"Sukiyaki Force" is the hero ensemble formed by sukiyaki ingredients locally available in Gunma Prefecture. In addition to fighting evildoers and protecting peace, they also introduce specialties of Gunma Prefecture.
comedy, [short 5min]
Chiruran - Nibun no Ichi
On the eve of a new era, Kyoto was in chaos. Different factions were moving at cross-purposes, and with the clash of different ideals, many were resorting to violence to enforce their views. To bring back order to the streets of Kyoto, Shinsengumi . the supposed guardians of peace . were formed. A chosen group of hot blooded youth, on a mission to save Kyoto, and to prove their worth... This is a tale of proud young Samurai mercenaries, who lived and died by the sword, in a turbulent period of political upheaval. To them, a man is defined by the way he dies.
historical, comedy, [short 5min]
Onihei Hankachou
Onihei is based on the historical novel series Onihei Hankachou and tells the story of Hasegawa Heizou, who metes justice on wrongdoers and supervises the crackdown on arsonists and robbers in Japan’s Edo period (1603-1868).
historical
ACCA - 13-ku Kansatsu-ka
In a world separated into 13 wards, with each ward having an observation division controlled by the organization known as "ACCA." Jean is known as the craftiest member of ACCA.
sci-fi
Hand Shakers
In Osaka in the year "AD20XX," Hand Shakers are partners who can summon "Nimrodes," weapons born from their deep psyche by joining hands. In order to grant the pair’s wish, the Hand Shakers compete with and fight other Hand Shaker pairs. The top pair will then meet and challenge "God."
action, sci-fi
Kemono Friends
Japari Park is a gigantic integrated zoo. In the zoo, due to the mysterious "sand star" substance, the animals start turning into human-shaped creatures called Animal Girls. Japari Park is a place where many people visit and have fun at, but one day a lost child wanders into the park. The lost child starts a journey to return, but because so many Animal Girls join in on the quest it becomes an unexpected grand adventure.
animal girls
Piace - Watashi no Italian
High schooler Morina Nanase starts work at Trattoria Festa, an Italian restaurant filled with various and sundry quirky characters, and where through its unique cuisine, she will begin to mature as a person.
cooking, [short 5min]
One Room
You are the protagonist. The anime is about 3 stories that develop in your (one) room.
[short 5min]
Kobayashi-san Chi no Maid Dragon
Miss Kobayashi is your average office worker who lives a boring life, alone in her small apartment.until she saves the life of a female dragon in distress. The dragon, named Tohru, has the ability to magically transform into an adorable human girl (albeit with horns and a long tail), who will do anything to pay off her debt of gratitude, whether Miss Kobayashi likes it or not.
contemporary fantasy
Chou Yuu Sekai - Being the Reality
In a world where mysterious beings called Disasters continually threaten the peace of the world. A special military unit called Saber is formed to oppose Disaster. Private conglomerates and the independent self-defense organization Blade also form, and advance on the enemy. Noii is a high school student who years to join Saber and fight Disaster. After a mysterious girl named Motis transfers into his class, his normal life completely changes.
[short 15min]
Marginal#4 - Kiss Kara Tsukuru Big Bang
On February 13, as snow flurries dance in the air, a new idol unit is born at Pythagoras Production. They are the idols who will deliver their kiss to the ends of the galaxy: Marginal #4. Its members, Kirihara Atom, Aiba Rui, Nomura L, and Nomura R, put all their effort into their entertainment career for the sake of the fan supporting them! They continue to mature as idols along with the senior unit pulling the entertainment industry forward, Lagrange Point, and the younger unit preparing to make their debut, Unicorn Jr. But when they step off the stage, they’re ordinary high school boys with some chaotic student lives!
idols
Kuzu no Honkai/Scum's Wish
17-year-old Awaya Mugi and Yasuraoka Hanabi appear to be the ideal couple. They are both pretty popular, and they seem to suit each other well. However, outsiders don’t know of the secret they share. Both Mugi and Hanabi have hopeless crushes on someone else, and they are only dating each other to soothe their loneliness. Mugi is in love with Minagawa Akane, a young teacher who used to be his home tutor. Hanabi is also in love with a teacher, a young man who has been a family friend since she was little. In each other, they find a place where they can grieve for the ones they cannot have, and they share a loneliness-driven physical intimacy. Will things stay like this for them forever?
drama, psychological, romance
BanG Dream!
When she was a child, Toyama Kasumi felt a heart-pounding thrill every time she gazed at the stars, and she’s been looking without success for something that could inspire the same feeling ever since. One day, she comes across a star-shaped guitar in a rundown pawnshop and, for the first time, discovers the thrill she’s been searching for. Kasumi becomes determined to form an all-girl band, and her search leads her to four like-minded souls: Saaya, Arisa, Rimi, and Tae. Does this band have what it takes to make their dreams of stardom come true?
[after 1st eps night], music
Gan Gan Ganko-chan
The anime follows a boy named Gen, who time travels from the year 2020 to a distant future where humanity has gone extinct. He begins staying at the Ganko family home in the Rustling Forest, where he has none of the amenities he is used to: no electricity, gas, or running water, as well as no television, smartphones, convenience stores, snacks, or games.
[after 1st eps night], sci-fi, comedy, [short 5min], [for kids]
Koro-sensei Quest!

[spinoff], [sequel], [short 10min]
Ai Mai Mi - Surgical Friends

[sequel], [short]
Nanbaka 2

[sequel]
Ao no Exorcist - Kyoto Fujouou-hen

[sequel]
Shouwa Genroku Rakugo Shinjuu: Sukeroku Futatabi-hen

[sequel]
Reikenzan: Eichi e no Shikaku

[sequel]
Tales of Zestiria the X 2

[sequel]
Gintama (2017)

[sequel]
Yowamushi Pedal New Generation

[sequel]
ChaoS;Child

[sequel]
Kono Subarashii Sekai ni Shukufuku o! 2

[sequel]
Super Lovers 2

[sequel]
Rewrite - Moon-hen/Terra-hen

[sequel]
Sengoku Choujuu Giga - Otsu

[sequel], [short 3min]
Yami Shibai 4

[sequel], [short]
Kirakira Precure A La Mode

[spinoff]