Yuki Sasamori, a spirited and mischievous first-year high school student, shares a classroom with Kouta Oyamada as part of the main cast. Alongside her close friend Kiriko Takana, she thrives on stirring the school’s rumor mill, notably crafting Kouta’s reputation as a "Womanizer" by attributing Chizuru Minamoto’s relentless romantic pursuits to his supposed irresistible charm.

With infectious enthusiasm, Yuki dramatizes every charged interaction between Kouta and Chizuru, spinning their encounters into tantalizing gossip. Her antics persistently clash with class representative Akane Asahina’s attempts to maintain order, as Yuki’s provocations not only escalate the duo’s dynamic but also cement Kouta’s infamous nickname, "The Great Erotic King," throughout the student body.