One day, my parents decided to remarry due to their old age, which resulted in a sudden stepfamily situation where a gyaru became my stepsister. As expected, we didn't get along well since she was an introverted NEET and looked down upon me. However, one fateful night when both our parents went out on a two-day trip, my stepsister drugged me with sleeping pills and proceeded to violate me. From that moment onwards, until they returned home, she kept me captive and thoroughly trained me to be completely obedient.

両親の高齢再婚により突然ギャルが義妹になった。引きこもりでニートの僕とは当然反りが合わず見下した態度をとられ恨みを募らせていた。ある日両親が2泊3日の旅行に行ったタイミングで妹に睡眠薬を盛りレ×プを決行。 その日から両親が帰ってくるまで徹底的に監禁調教。僕のいいなりになるまで躾けてやった。