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Kogiku, who remarried his father 10 years ago, is my mother-in-law. My cheerful father died two years ago, and Mr. Kogiku, who looked lonely, seems to be fine now. The cram school that I used to do at home has resumed, and it seems that I have finally returned to the old days. It seems that the cram school is busy these days, so I'm a little worried about Mr. Kogiku's body. When I was wondering why I was so busy lately, I found a surprising fact. Apparently Mr. Kogiku is giving a nasty class. I couldn't believe it, but when I looked into the class scene, Mr. Kogiku and my mother-in-law were in trouble ...