Imouto Bitch ni Shiboraretai

Based on the CG collections by Yorokobi no Kuni (ヨロコビの国). Episode 1 Invited by friends for a date together. Looks like something strange, there is one woman who looks like less comfortable. Feel like I've met, maybe met often. Unwittingly the woman is my own sister! In the same karaoke room, we play