Synopsis
Customize your stepsister’s body freely!
Adjust her diet, water intake, and menstrual cycle schedule.
Observe her changing daily life as it unfolds!
Use sleeping pills to make her drowsy and play pranks! Use forbidden brainwashing for perverted play!
≪STORY≫
My stepsister, born to my father’s new wife.
Starting tomorrow, I’ll finally be living alone with her. I’ve renovated the house with secret peepholes and installed special mechanisms in the bathroom.
I won’t just spy on her daily life—I’ve also rigged the bathroom sewage to flow into an underground secret room.
Armed with the strongest sleeping pills and brainwashing techniques, I wait for her arrival.
■ACTION-SELECTION SIMULATION ADVENTURE GAME
Predict your stepsister’s movements and spy on her! Uncover her unsuspecting daily secrets!
■INTERNAL BODY CUSTOMIZATION
Manage her internal organs, bladder contents, and menstrual schedule! Watch as her changing condition reveals various secrets. Use the calendar to freely choose your spying schedule and observe her daily transformations!
■GROW TIRED OF SPYING? TAKE DIRECT ACTION!
Use the strongest sleeping pills for pranks, or assault her directly with forbidden brainwashing that allows anything! Put her to sleep and ravish her. Brainwash and penetrate!
■COLLECTION STORAGE INCLUDED
A secret room for scatological content. Collect embarrassing photos and other materials from your stepsister!
■IMMERSIVE VOICE ACTING
Spying scenes feature authentic environmental sounds recorded on-site. Secretly recorded in a female voice actress’s room. Bathroom, shower… and masturbation too?
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