Hikari must go on a date with Kei on Sunday, as promised when he was recovering from a fever. However, their "date" is interrupted by Sakura Ushikubo, Kei's future fiancée, who takes Hikari away and befriends her. When she agrees to help Sakura find out more about Kei, Hikari begins to feel some unexplainable feelings regarding Kei.
