During her first year of high school at Christmastime, Mimi encounters two strikingly handsome boys whose personalities are decidedly unpleasant. The encounter is brief and leaves little impression beyond annoyance. When she advances to her second year, however, all three are placed in the same homeroom and are elected as class representatives. Forced to work together on a daily basis, the initial friction begins to shift into something more complicated. Mimi finds herself caught between the two boys, each of whom harbors his own hidden vulnerabilities beneath a rough exterior. The story unfolds as a classic high school love triangle set against the backdrop of class committee duties and ordinary school life. A recurring motif involves the study of geology and minerals, with the characters’ interactions occasionally framed through the lens of rocks and gems—a subtle metaphor for the slow, layered formation of bonds. The narrative follows Mimi’s emotional growth as she navigates misunderstandings, jealousy, and the gradual revelation of each boy’s true feelings, leading to a resolution that chooses one side of the triangle. The setting is a contemporary Japanese high school, and the tone stays within the conventions of shoujo romance, emphasizing emotional tension and small, meaningful moments over dramatic plot twists.