Mai-chan, who is curious about naughty things rather than studying around the age, is a perverted ronin who is peeping at the place where she is masturbating while staying at home and the place where she is having sex with her boyfriend I have an older brother. One day, the night when my brother sneaks into Mai-chan's room and goes on a daily basis ● I failed, and on that day the power relationship reversed and my brother who became my sister's servant became butter from my sister like a daily routine I will be treated as a dog ... I have this older brother and this younger sister!
