Koi-ken!

Koi-Ken! (こいけん!) is a manga series by Maito Yoshihara. A 12 episode ONA series under the name, Koi-ken!: Watashitachi Anime ni Nacchatta! (こいけん！～私たちアニメになっちゃった！～) was also produced.

Plot
Mobile anime adaptation of Koi-Ken!, a dating simulation game.

The story depicts the campus life of members of Renai Kenkyuukai (The society for the study of romance) or "Koi-ken".

The protagonist's "extremely ordinary" high school life changes overnight when he encounters Kaede, a girl who is returning from living abroad and transferring into the school.