Overview:

A month of cohabitation begins during a long summer vacation in a luxurious mansion without our parents. It includes seven intense H-scenes and over 300 beautiful CG variations. Enjoy a world of sensuality that will stir your sinful side!

Full version release: Early October! Stay tuned!♡

My parents are away on a business trip, leaving my sister and I alone in the sprawling mansion.
A sweet yet dangerous atmosphere gradually begins to permeate the silent hall.
My girlfriend, who is usually unsociable towards me, shows a different side of herself on nights when we’re alone.
She sleeps adorable in her loose pajamas. Her soft chest and smooth, pale skin peek out from under the hem—everything about her deeply moves me.
Every time I feel her sweet, defenseless breath, the forbidden desire I’ve been suppressing deep in my heart begins to throb.
“I can’t hold back any longer…”
My uncontrollable feelings grow, and I finally resolve to break the taboo between brother and sister and make my sister fall in love with me. However, this summer vacation, it seems that not only is my sister secretly attracted to me, but the attractive girls around her are also secretly harboring feelings for me. We’re only living together for one month—will I be able to contain the excitement in my heart, stained with immorality?
It’s only for one month. This is the beginning of our forbidden brother-sister cohabitation—♡