After eight years separated, Yui is living with her older brother, Hayato again-however, her heart now inexplicably flutters when she is with him. Her childhood friend, Ritsu, suggests he and Yui date—even if it’s just for show—to suppress her feelings. Also, it helps Ritsu out with avoiding all the attention he receives for his good looks from other girls. Even so, Yui feels that she is inconveniencing Ritsu with all the unsolicited help. What does Ritsu really want out of this situationship? And how does Hayato feel about his little sister suddenly dating someone?