Tsundere de Yandere na Osananajimi - Takanashi Futaba-san to H na Koto o Suru Game

Futaba is a high school student. She is smart, good at sports, and liked by everyone. One the other hand, Michiru, the main character, is just mediocre.... They are promised to marry..., though Futaba doesn't want it. One day, Michiru meets a beautiful girl, who has just transferred to their school. Futaba accidentally sees it and runs away angrily, but she stumbles and almost falls down the stairs. Michiru narrowly saves her, but he gets injured. As Futaba takes care of him, they gradually get closer and finally.... Happy ending? No, no. Hinako whom Michiru met the other day and Chidori, a school doctor, take part in the story and various H happenings and events happen! Also, Futaba is found to be yandere.... Will Michiru be able to get back a peaceful life?