A sneaky sex movie of Kanon Tennen girl, Yosuke is Haruka’s boyfriend and the two are living together. Yosuke and Haruka work different overtime so the two have very little time together. Yosuke asks Haruka for permission to make love together today since they haven’t done it in a long time. Haruka agrees to let Yosuke enjoy himself when he gets home from work. After coming home from work, seeing her lover sleeping, today she wore an extremely sexy underwear that Yosuke couldn’t hold back anymore. He was walking when he saw the girl’s face below, it was Kanon-chan, his girlfriend’s younger sister! It turned out that she had an argument with her mother today, so she came here to hide. But fortunately he didn’t stay long, when Yosuke came home from work tomorrow morning, he would already be home. And Haruka promised to make it up to him today. When I got home, I saw a naked woman wrapped in a towel coming out of the bathroom. Thinking that his girlfriend had to go home because of Kanon, Yosuke didn’t hesitate anymore. He quickly rushed at her, releasing all the discomfort of the day. But when he was happy, the scarf came off, the girl he was making love with was Kanon! Because of panic and confusion, he lost control and poured all his semen into his lover’s sister…