My name is Tsubakihara Yuji and I am an ordinary Japanese student. For some reason, I am forced to live together with two sexy blonde twins. I've been in love with them since I was a little girl. Yuna is the eldest of them. Sometimes she gets very... very intimate with me and she's not shy about kissing me in public. That's probably because she's half American. She's shy around strangers and has her own fanclub, where fans call her "the unapproachable mountain flower" or something like that. Nina is the younger and more outgoing sister. She has lots of friends and acquaintances and excels in sports and academics. When my parents died, their family took me in. That's how my joint, turbulent sex life with two sexy, titsy twins began...