Moeko Kobashi dates Ritsurou Yoshinari within a complex love triangle involving Ritsurou and his troubled best friend, Ken Amafuji. Her relationship with Ritsurou becomes a significant obstacle for Ken, who harbors deep, unexpressed feelings for him. Seeking to disrupt Ritsurou's relationship and draw closer to him, Ken initiates a one-night stand with Moeko. This act significantly strains her bond with Ritsurou and catalyzes the narrative's central emotional conflicts.

Despite her initial role as Ritsurou's girlfriend, Moeko also develops feelings for Ken following their encounter. Her actions contribute to the escalating tensions among the trio. Discovering the developing romantic relationship between Ritsurou and Ken, including witnessing them kiss, triggers intense emotional distress in Moeko. Her reaction involves cutting her hair short, an impulsive act conveying her anguish to Ritsurou.

Following her breakup with Ritsurou, Moeko's trajectory suggests a potential shift in romantic focus. Indications arise that she may develop a crush on Hiroto, her 28-year-old history and homeroom teacher, shifting her attention towards new personal connections separate from the initial love triangle.