Yuta, who has always been led around by his expressionless childhood friend 'Hime-no Ran,' who is hard to read. Suddenly asked, 'I have a boyfriend now so I want you to be my sex practice partner.' Yuta, who likes Ran, has no reason to refuse and practices sex. But he has a personal rule that 'you can only kiss with someone you like,' so he won't let anyone kiss him. He had been expressionless all along, but gradually started to feel pleasure and showed erotic expressions and sounds, making Yuuta unable to hide his emotions...!
