Haruka, a married woman intrigued by the rumored health practice of "Anal Sunbathing," made it a daily ritual to discreetly spread her anus and bask in the sun during the day, avoiding her husband's gaze. One day, she decided to host a house party to cheer up her despondent subordinate, Makoto, who had been making mistakes at work. The three of them, fueled by alcohol and a casual atmosphere, ended up getting quite drunk. Makoto, unable to hold his liquor, ended up staying over. The next day, Haruka was enjoying her usual anal sunbathing session when she was caught by Makoto, who had just woken up...
