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
Absolute Duo
Blaze is a weapon that is the manifestation of a human’s soul. Kokonoe Tooru happens to be qualified for this, but for some reason his Blaze is not a weapon, but a shield. Moreover, he enrolled in a school that teaches combat skills, and thanks to the school’s Duo partner system, he ends up living with a beautiful silver-haired girl.
action, fantasy, harem, school life
Yurikuma Arashi
Far off in space, the asteroid Kumaria blew up, sending bits and pieces to rain down on Earth. For reasons unknown, this causes all the bears (kuma in Japanese) to simultaneously rise up and begin attacking humans. Finally, a giant Wall of Severance was built to divide them from each other and end their ceaseless war and hatred. In the human world, at Wuthering Heights Academy, Kureha and Sumika are friends who’ve fallen in love. When they find a lily blooming in their favourite flower bed, their eyes meet... and all at once the Bear Alarm starts ringing, signalling that the human world is under attack.
fantasy
Binan Koukou Chikyuu Bouei Bu Love!/Cute High Earth Defense Club Love!
Teenage boys are notoriously lazy, and the members of Binan High School’s Earth Defense Club are no exception. Their definition of ’earth defense’ is bumming around all day at the local bathhouse. But when a pink wombat appears out of thin air and begs the boys to help him save the planet, even the idlest high schoolers jump to action. Watch the magical boys transform and save the earth with the power of LOVE!
comedy, parody, magic, school life
Military!
The story takes place during a conflict between the Krakozhia Dukedom and the Grania Republic. In the midst of the fighting, a savior appears to the Krakozhia Dukedom, and it is a high school student named Yano Souhei. Two female soldiers, First Lieutenant Ruto and Second Lieutenant Haruka, appear in tanks to intrude on Souhei’s everyday life, followed by the enemy soldier Shachirofu, all of whom use firearms without hesitation at his house.
[short 5min]
Kantai Collection
In a world where humanity has lost control of the oceans to the deep sea fleet, the only hope to counter this threat are the Kanmusu, a group of girls who possess the spirit of Japanese warships. The story revolves around Fubuki, a destroyer who comes to the Chinjufu base to train with other Kanmusu.
action, battleship-girls
Shinmai Maou no Testament/The Testament of Sister New Devil
Toujou Basara is a high school student whose father has suddenly just remarried. His father then departs overseas leaving Basara with two new beautiful step-sisters. Little does he know, his new sisters, Mio and Maria are actually the new Demon Lord and a succubus!? Almost trapped into a life of servitude, Basara forms a reverse contract by accident and ends up becoming Mio’s master! Hijinks ensue as Basara finds himself in one ecchi situation after another. However, Mio’s life is in danger as she is pursued by demons and heroes!
action, romance, supernatural, ecchi
Saenai Heroine no Sodatekata/Saekano: How to Raise a Boring Girlfriend
One day, an otaku high school student Aki Tomoya has a fateful encounter with a girl amidst the beautiful cherry blossom trees. This meeting inspires Tomoya to design his very own gal-game (dating-simulation video game) featuring a heroine modeled after the girl he saw. In order to make his desire a reality, Tomoya must persuade a few eccentric creators such as the ace member of the art club, Sawamura Spencer Eriri and the school’s top student, Kasumigaoka Utaha to join his development team. Meanwhile, Tomoya is shocked to learn that the girl he idolized as his muse for this whole project was none other than his boring classmate, Katou Megumi! But, this doesn’t dissuade Tomoya. He is determined to give Megumi a total make-over within his game and raise her to be the absolute girlfriend that every man desires...!
comedy
Koufuku Graffiti/Gourmet Girl Graffiti
After her grandmother passed away, high school student Ryou Machiko began living by herself. Although she recreated her grandmother’s recipes perfectly, she felt that something was missing. However, when a girl named Kirin begins visiting her home, she realizes that company makes any meal taste better. Together with their friend Shiina, they enjoy many different kinds of delicious foods together.
cooking, comedy, slice of life
Juuou Mujin no Fafnir/Unlimited Fafnir
Twenty-five years ago, the world suddenly changed when monsters called Dragons appeared; seeking to ravage the earth and find mates. Over time, superhuman girls possessing the powers of the dragons, called D girls were born. Mononobe Yuu is the only male D in existence and is forced to enroll at Midgar - an academy for D girls. At the academy, he accidentally runs into Iris, a delinquent D girl, while she’s naked, and even reunites with this long lost sister, Mitsuki, whom he was separated with at birth. Will Iris and Yuu, the boy who is supposed to become the strongest assassin, be able to challenge the seven dragons that threaten to destroy the world?
magic, harem, school life
The IDOLM@STER: Cinderella Girls
There are many idols with long-established talent agency 346 Production. And now the company is starting a new program, the Cinderella Project! Girls leading normal lives... They are chosen to be aspiring idols and see another world for the first time in this Cinderella story. Can they all climb the stairs that lead to the palace? The magic begins now...
music, idol, [spinoff]
Ansatsu Kyoushitsu/Assassination Classroom
One day, the moon exploded, leaving it in a perpetual crescent-moon shape. The creature who claims responsibility for the destruction also claims it will destroy the world in March of next year. With powers beyond human comprehension, no military can stand against it. Yet, for some reason, it chooses to take up occupancy as a teacher in the worst class of Kunugigaoka Middle School. The fate of the world rests in the hands of its students, as they have until graduation to figure out how to murder their teacher and collect ten billion yen for saving the world.
action, drama
Death Parade
After death, humans go to either heaven or hell. But for some, at the instant of their death, they arrive at the Quindecim, a bar attended by the mysterious white-haired Decim. He challenges them to the Death Game, wherein they wager their lives and reveal their true natures. Decim himself is the ultimate arbitrator of who wins and who loses, who lives and who dies.
drama, mystery
The Rolling Girls
In the wake of the Great Tokyo War, Japan - as the world once knew it - no longer exists. What remains is a fragmented network of independent nations, each ruled by a prophet known as a Mosa. Every Mosa commands an army, or Mob, as they seek to conquer anyone in their path. Enter Nozomi, Yukina, Ai, and Chiaya. Together, these intrepid and adorable girls travel across battle-ravaged Japan, seeking to transform themselves - and their world!
Yoru no Yatterman/Yatterman Night
Long, long ago, a pair of heroes called the Yatterman faced off against the mischievous Doronbow Gang, led by the sexy villainess Doronjo. Now, years later, the Yatter Kingdom is protected by the new Yatterman. But the mysterious new Yatterman have forced the Yatter people into labor, and unrest runs rampant throughout the kingdom. In the spirit of her predecessor, a young new Doronjo reforms the Doronbow Gang in rebellion against the Yatterman.
Junketsu no Maria/Maria the Virgin Witch
During the Hundred Year’s War between England and France in the Middle Ages, a powerful witch named Maria lives in a secret forest with her familiars. She hates the war around her, and will sometimes stir up trouble against the church that does nothing to stop it. Her interventions into the world, however, run against the plans of heaven, earning her the attention of the Archangel Michael.
magic, violence
Seiken Tsukai no World Break
Akane Academy is just like any other school... except the students just happen to be reincarnated legendary heroes from a distant past who battled for the fate of the world. Now, evil monsters are threatening to wreak havoc, and it’s up to the students of Akane Academy to stop them!
action, magic, school life
Sengoku Musou
In late 16th century, the era of civil war that tore Japan over two centuries is nearing its end and the regional warlords who survived the bloodsheds are ready for a final showdown. In the battlefield where your best ally turns out to be your worst enemy, only the shrewdest can come out alive.
samurai
ISUCA
Asano begins work as the housekeeper for the old family of Shimazu, where he meets the ill-mannered, selfish, beautiful Sakaya. She is actually the 37th head of the Shimazu family in charge of sealing away monsters with Spirit Archery. Discovering that he has the powers of "true names" and "true eyes,"Asano becomes wrapped up in Sakaya’s battle with the monsters as her assistant.
action, comedy, romance, supernatural, harem
Tantei Opera Milky Holmes TD

[sequel], comedy, action
Kami-sama Hajimemashita 2

[sequel]
Tokyo Ghoul Root A

[sequel]
Soukyuu no Fafner: Dead Aggressor - Exodus

[sequel]
JoJo no Kimyou na Bouken: Stardust Crusaders - Egypt Hen

[sequel]
Shounen Hollywood - Holly Stage for 50

[sequel]
Durarara!!x2 Shou

[sequel]
Aldnoah.Zero 2

[sequel]
Dog Days S3

[sequel]
Kuroko no Baske 3

[sequel]