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Makoto, who is a bit sadistic, and Rico, who is a masochist, are a close couple with matching sexual preferences. One day, they plan a hot pot party with four of Makoto's friends to introduce a man to Rico's best friend Sora, but at the last minute Makoto's friend can't attend, so they have no choice but to have the hot pot with just the three of them. Sora is asked to buy some alcohol, but he accidentally witnesses Makoto and Rico having sex. Makoto feels awkward after seeing Rico ejaculate, while Rico is unaware of the situation. At the hot pot party, Rico gets drunk and falls asleep, and the devilish Sora begins to tease Makoto's nipples at her side...