My hot older sister (fashionable, aloof, and lecherous) from my remarriage to my family lives in the same room as me in the kids' room! I'm being relentlessly trained by this tsundere, obsessive woman every day... Luna Tsukino BLK-627

My parents' remarriage suddenly gave this nerdy guy a trendy older sister! And since it's my room, we have to share... Uh, I feel a little uneasy... In the otaku-style room, I heard the heartbreaking words, "How tacky..." But actually, this older sister is quite tsundere! She even made me lose my virginity and gave me oral sex when our parents weren't home—she's such a little devil! A brother-sister relationship (girl/trendy party girl and boy/nerd) with completely different clothes, personalities, and interests—incestuous cohabitation!