Let's break the rules of happiness a little... The story of a girl who, since childhood, has been subjected to confinement and rape, now grown into adulthood. In my house, after my mother passed away five years ago, I lived with my father, grandfather, and older brother. Recently, my father remarried, and with the arrival of our new family members, a new life began. The new wife and her daughter were kind, and we quickly became close, deluding ourselves into believing we were enjoying happy days. But on the 99th night of this new life, my father, who should have returned home as usual, never came back and stopped contacting us. That was the moment I should have realized the tragedy descending upon our family. Then, on the 100th day, my stepsister Ichika captured me, locking me underground where I became her plaything. *This work blends various fetishistic torture scenes using every imaginable form of restraint, forming a slightly emotional, psycho-themed mischievous aggressive girl drama. A deeply moving story driven by her intense, captivating personality.