A spiral love story. Kouno Jun is a spirited character who lives life to the fullest. In kindergarten, he falls in love with Hasebe Rino, the most beautiful girl in his class, and confesses his feelings to her. Hasebe accepts his love, but the moment she gives her answer, she vanishes on the spot. Unable to figure out what is going on, Kouno asks his friends about Hasebe, only to discover that no one remembers a single thing about her. She has simply vanished, along with all memories of her, except for those held by Kouno. While Kouno endures a weary and desperate high school life, Hasebe reappears as a transfer student. However, this Hasebe is not exactly the Hasebe he knows...