[Kerberus] Shizuka Chan

A quiet boy's long-awaited weekend invitation from Shizuka — the popular, big-breasted classmate he's adored from afar — curdles into a nightmare when the smiling girl beside him turns out to be Koji, whose soul slipped into her body during a mysterious infirmary incident and has no intention of ever leaving. Trapped in Koji's old male body, the real Shizuka can only watch as the impostor shamelessly enjoys her new curves, teases her crush with lingerie and stolen intimacy in public, and declares her merged flesh a slave loyal to him alone. As the weeks pass, even the narrator begins surrendering to the sweet-faced stranger wearing his friend's skin, accepting the new 'Shizuka' and the twisted normal she's built.