 Kōhei is living a normal life in high school with Mizuka , and gets to know five other girls throughout the story who he helps with their various personal problems . While Kōhei likes to joke and tease these girls , deep down he is nice to girls and genuinely wants to help them . In the story , Kōhei is able to form intimate relationships with the six heroines : Mizuka Nagamori , Rumi Nanase , Misaki Kawana , Mio Kouzuki , Mayu Shiina , and Akane Satomura . While a given relationship will start out well , before long those around him start to forget him as he begins to retreat further into the Eternal World . If Kōhei forms a strong bond with one of the girls , she alone remembers him even after he leaves to the Eternal World . This ensures his eventual return one year later when he and the girl reunite . 
