Imouto Bitch ni Shiboraretai

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 King Game. Then, what will happen to me with my sister later? (Source: Translated and Edited from Nekopoi)