Recently, Kotaro started exercising in the hopes of meeting the busty beauty who runs around his neighborhood. At his wife's suggestion, he also decided to attend a hot yoga class... The instructor at the class turned out to be the busty beauty. After that, they got closer in a mixed sauna bath and ended up in a relationship, and continued to make love while sweating. Kotaro enjoyed his days attending yoga classes, but one day, when he returned home, he found that the instructor was introduced to him as a friend of his wife...