On her way home, Seira is suddenly captured by a man, imprisoned, and brutally raped. Her days are filled with endless suffering and terror—until one fateful moment when her mind and body begin to undergo a drastic transformation. Awakening to pleasure through her delicate frame, she evolves into a lustful girl who actively craves the man's cock. Her aroused body thrills at the penetration of his thick shaft, moaning and losing herself in waves of maddening ecstasy. This metamorphosis will forever alter the course of her life.