Tsubomi is kidnapped by a vicious man who subjects her to intense training, forcing her to obey as his submissive slave. Through this process, her slave mentality deepens as she is repeatedly used like a sex toy, her mind and body completely dominated. Fearing a police raid, he locks her inside a box and hides her away. By chance, I discover her in that state and gently draw out her feelings as a slave. Captivated by her masochism, I awaken her true nature as an obedient, deeply masochistic girlfriend. Gradually, through my kindness, her emotions return, and a new relationship blossoms—she experiences multiple orgasms under my loving domination.