Description

Gal Big Sister Z turns a bitter family feud into an unpredictable power struggle when a mysterious hypnosis device falls into the hands of a frustrated university student. Developed by POISON, version 1.0 follows Niihara Daiki as he discovers that reversing the rules at home can bring consequences he never expected.

For as long as he can remember, Daiki has been his sisters’ unwilling errand boy, burdened with chores and punished whenever he protests. After an upperclassman tells him about a hypnosis device, he gives it a skeptical try—and finds that his once-domineering sisters now obey his commands. What begins as an escape from years of mistreatment quickly becomes a revenge-driven reversal of the household hierarchy.

Featuring 2D CG artwork, Gal Big Sister Z centers its story on resentment, control, and the fallout of unchecked power. The central draw is Daiki’s changing position within the family: as he settles old scores, his apparent victory gives way to an unexpected turn. Download and play Gal Big Sister Z to discover where his pursuit of payback leads.