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The Yamashita family, a judo family who never misses training every day. At first glance, it looks like a harmonious family, but Yayoi secretly raised funds for the dojo on the condition that she would have a mistress relationship with her brother-in-law. One day, Tsuyoshi, a virgin, reveals his secret feelings for his mother as soon as he is asked about his lack of practice. As a man, I wanted to be a full-fledged man, so I decided to give him a brush at the rehearsal hall, but I gradually began to love my son as a woman, and I was worried about my relationship with my brother-in-law.