Our protagonist plays Russian roulette. Except instead of using a gun with six bullets, he uses a different type of gun with six girls. One of the girls is his sister.
My theory is that all of the girls are his sister, and we’ll get one big happy family in the end.
Regardless, this show is pure and utter crap. Everything the girls do is taken straight out of the textbook. They all make me want to strangle them. Dropped with the purest of hatred.