Despite feeling optimistic for her upcoming high school life, Haru faints after stumbling into a group of thugs but — unbeknownst to Haru — Raku saves her. While intent on knowing the identity of the 'prince' that rescued her, Haru meets Raku but eventually recognizes him from rumors of being a dangerous, womanizing gangster. After Raku unintentionally catches a glimpse of Haru's underwear twice, Haru vows to protect her sister — Kosaki — from Raku while in bewilderment of his popularity with some of the girls. After Kosaki tells Haru about Raku's good sides, Haru has in her possession the clue into finding her 'prince', Raku's pendant.