Momoko is the main character in the series. As a member of the school's disciplinary committee, she takes this responsibility seriously and often clashes with her classmate Shinobu due to their differing personalities. While Momoko can be irritable and intolerant towards others, she also has a kind side that makes her popular among her peers. She is known for wearing a strong-smelling perfume which reveals her presence before she even speaks.
Momoko first met Shinobu several years ago in a park when they were both young children. At the time, Shinobu gave Momoko a cookie and Momoko reciprocated with a kiss. Although Momoko does not remember this encounter, it left Shinobu with deep feelings of love for her.
Despite Momoko's initial reservations about Shinobu due to her promiscuity, she eventually warms up to her classmate and realizes that Shinobu is genuinely kind and truly loves her. In fact, Momoko even takes action to protect Shinobu from an upperclassman who had forced herself on her.