[ENGLISH-SUBTITLE] SONE-183 I was aroused by the bold seduction of my girlfriend's younger sister (a female idol), and I continued to cheat on her many times.

Miyu is a popular idol, and to me, she is also my sister. And it seems that she has a serious crush on me. However, no matter how genius and cute she is, I can't betray my precious girlfriend. That's what I thought... "You can use me, an id