MNGS-078 | Haruhi Moka is a *gyaru* big sister who is far too kind to her shut-in younger brother (me)—whom even his own family has abandoned. She comes running the moment I call, spoils me, and acts as my personal human sex toy, letting me have raw, unprotected sex with her over and over again.

"It's okay, it's okay. If something's bothering you, you can just use your big sister as a sex toy..." Moka, a *gyaru* who has returned to her hometown from university, is worried. Her younger brother, Kazuma—whom she has always adored—has become a shut-in. Having always spoiled him, Moka resolves to accept his anxieties and desires, transforming into a woman who exists solely for her brother—ready to rush to his side the moment he calls. She holds him close every day, offering total affirmation like a Madonna while gently embracing even his carnal desires. Eventually, however, the intense affection between them begins to warp into a twisted relationship...