A group of close friends, both male and female. Miko, a female friend, is basically a recluse and isn't good at getting along with other girls, so she doesn't have many friends of the same sex and has always been the type of girl who has been hanging out with male friends. When she comes to hang out at a hotel, they decide to play a prank and make a penalty game where the loser has to "show off masturbation." The guy who suggested it loses, exposes his penis in front of the two girls, and starts stroking... It's the first time Miko has ever seen a male friend...