Second‑year student Kotarou Kawaii has a strange companion. During his elementary years he invented a slime that suddenly became alive, and for the last seven seasons they have shared countless moments together. Yet Kotarou faces a dilemma. The tension grows as he realizes the line between friend and something more blurs. Both have matured over the years, and Puniru has evolved into an astonishingly beautiful young woman. Her appearance alone astonishes him, but she also morphs effortlessly into a variety of adorable slime shapes, leaving Kotarou both thrilled and perplexed by her playful antics each day. Can the pair keep their friendship alive amid these new challenges, or will their bond dissolve as they grow older?
