A woman happens to be in a mixed-gender hot spring. He can't help but stare at her big breasts and gets a full erection! Since it's going to be awkward anyway, he might as well give it a go! So he dares to show off his erection. Instead of being rejected, he is intrigued and glances rush out! Because it is an unreasonable act, if he throws away his small pride and does it with confidence, will he be able to have a good time with an incredibly gorgeous woman?!