Moe Katsuragi is a young girl grappling with profound melancholy, mistakenly convinced the boy she admires favors others. Her despair draws Risky, an apprentice shinigami tasked with claiming her soul, whose efforts are hindered by Safety—an apprentice angel sharing their body, emerging when Moe’s positive emotions surface. This dualistic bond between Risky’s manipulation of her sorrow and Safety’s nurturing of hope propels Moe’s growth from fragility to resilience as she navigates existential dilemmas and mundane challenges.

Her journey centers on daily life and relationships, particularly with Yuya Fukami, a boy she connects with after a chance phone card encounter. In the anime, she opts for contact lenses during school or meetings with Yuya, contrasting her manga counterpart’s consistent use of glasses. Their relationship evolves from initial misunderstandings to a supportive bond, developed through episodic blends of humor and heartfelt moments.

Risky and Safety’s conflicting influences inadvertently guide Moe toward balancing joy and sorrow, though her transformative milestones remain subtly woven into her interactions. Her background remains anchored to the main series’ events, with no exploration of family history or pre-story experiences. Her narrative unfolds exclusively within the original 24-episode anime and three-volume manga, without expansion into supplementary media.