Initially perceived as a cheerful high school freshman, Kirari Aokigahara's routine takes a peculiar turn when she stumbles into a meeting at Seaside Cafe, organized by Rushio from Suicide Cafe. Amidst a group of despondent souls, Kirari stands out with her radiance. After participating in a simulated suicide attempt, she awakens from a haunting dream to witness a transformed atmosphere among the once-dejected attendees. Frustrated by her survival, Kirari's subsequent suicide attempts prove futile as she discovers her newfound invincibility. Tasked by Rushio to prevent others from taking their own lives, Kirari embarks on a journey as a 'Suicide Girl,' destined to bring hope and salvation to those in despair, including the girl from her prophetic dream.