Six months ago, Sakuta Azusagawa had a chance encounter with a bunny girl in a library. Ever since then, hes been blissfully happy with his girlfriend: Mai Sakurajima, that same bunny girl. However, the reappearance of his mysterious first crush, the now-adult Shouko Makinohara, adds a new complication to his relationship with Mai. To make matters worse, he then encounters a middle school Shouko in the hospital, suffering from a grave illness. Mysteriously, his old scars begin throbbing whenever hes near her.

With Shoukos bizarre situation somehow revolving around him, Sakuta will need to come to terms with his own conflicting feelings, for better or worse. With a girls life in his hands, just what can he do?

[Written by MAL Rewrite]