My parents remarried and I, a gyaru, suddenly got a gyaru older sister! Moreover, my room is the only room for the kids, so we have to share it... I'm so nervous... In a room that is full of otaku activities, she says "lame..." and it hurts. But this sister is actually quite a tsundere! She makes me lose my virginity as if to mock me, a virgin, and sucks my dick when my parents are not around. She's such a little devil! An older sister (a gyaru) and a younger brother (an otaku) who dress differently, have different personalities and hobbies, and live together in incestuous cohabitation!