Furami Furamingozuka, the sole daughter of her hometown hospital's director, grew up bearing intense pressure to fulfill familial expectations. An undisclosed childhood trauma forged her reserved, introverted nature, complicating emotional connections. At high school, her calm stoicism and analytical mindset set her apart. Though academically gifted and respected, she grapples internally with isolation rooted in unresolved trauma, causing her to prioritize logic over emotional expression.

Gruesome hometown murders disrupt her life, compelling her into an investigative partnership with close friend Kotobuki Hananokouji. Her methodical, detail-oriented approach becomes vital in dissecting the crimes, revealing her deep sense of duty. The inquiry forces a collision between past and present, making her confront suppressed trauma.

Simultaneously, school turmoil erupts over the student council election. Her best friend Kaerugawa Erutaka aligns with Raionji Raiou's elite faction, sparking interpersonal friction. Furami stays fixated on the murder mystery, yet her relentless pursuit of truth gradually draws her into closer collaboration with Kotobuki—signaling subtle growth in teamwork.

The investigation climaxes during the election's symbolic "bone-to-bone collision" event. Here, Furami's traumatic history proves pivotal to solving the murders. This crucible fosters incremental change: she processes long-buried emotions and begins forming tentative bonds, though her core reserve remains unaltered.