Taichi Yamada is an ordinary, lonely boy who falls in love with an idol named Kokoro Shina. One day, a DVD promotion and a handshake event with the idol take place on the rooftop of a complex. Kokoro falls from the rooftop onto Taichi, who is on his way to the event. Both are hospitalized. Taichi sustains only minor injuries, while Kokoro undergoes surgery. While a nurse explains the incident to Taichi, Kokoro appears in his ward. However, she comes through the wall! What happened to her?