Seiji Kishi

Satou Ichirou once called himself 'Maryuin Koga' and behaved as if he were a hero in a fantasy world. His strange behavior caused his classmates to bully him and he left the school. At his new school, he tries to behave like a normal boy, but one day he meets a girl who cosplays with a blue cape. (imdb)

Michishio Nagasumi's life couldn't be any more normal. In an odd twist of events, during his summer vacation he ends up almost drowning in the sea. Luckily, the cute mermaid Seto Sun appears to save him. However, Sun is from a yakuza mermaid family and according to their law, if a human is to catch sight of a mermaid, either he or the mermaid must die. The only other way is for Nagasumi to be taken in as a family member, marrying Sun. (myanimelist.net)

A powerful creature claims that within a year, Earth will destroyed by him, but he offers mankind a chance by become a homeroom teacher where he teaches his students about how to kill him. An assassination classroom begins. (imdb)

A great evil is sweeping over the realm; an evil that the young swordsman Roan and his life-long companion, the acolyte Yufa, must face head on! For these two travel toward their destiny, from the highest towers to the depths of the underworld, through forest and desert alike. With an ever-growing cast of fellow heroes, fate will grasp these travelers by their very souls and propel the band of skilled adventurers towards a noble end. (myanimelist.net)

Fate/Prototype is a reimagined version of Kinoko Nasu's original version of Fate/stay night. The storyline takes place eight years after the tragic Heaven's Feel. Here, the Holy Grail is still the so desired object. However, the darkness under this so-called "Grail" is revealed while the characters proceed to fight against each other in order to win. (themoviedb)

Assassination classroom : 365 days time period is about Nagisa and Karma coming back to their classroom 7 years later. (imdb)

The Future Foundation is in shambles after the Final Killing Game and the revelation of the true culprit. As a desperate plot arises from one of the survivors to rid the world of despair once and for all, the remaining Future Foundation members must band together to stop this atrocity from taking place. Fortunately, they find themselves with help from a group of unlikely allies as they race against the clock to stop their world from being changed... (imdb)

A catastrophic event announces the existence of a powerful alien being that wants to destroy the world. The event also gives a group of children the ability to summon demons and use them to fight the alien force. (imdb)

Caren Ortensia attempts to control the world using money with varying degrees of success, Phantas-Moon receives a movie adaption of her T.V. show, and Shiki is involved in a love plot that spans years.

At Hope's Peak Academy, a school full of extraordinarily talented individuals, Nagito Komaeda is an ordinary boy with no special traits or interesting skills to speak of-except for his incredible unluckiness (imdb)

As the Blue Steel gets closer to understanding the origins of the authority controlling the enemy, Iona's past starts to reveal why the war began and her reason for siding with humanity. (myanimelist.net)