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Identity: It's a fanmade MSA anime and manhwa.
Background: In Tokyo, Japan, a 50-year-old woman named Kanako from the Sugihara family saw that her well-behaved 24-year-old biological son named Masashi whom she wanted him to be another well-behaved girl who is an 18-year-old named Sayaka from the Hashimoto family's boyfriend had given his hoodie for the well-behaved 23-year-old first protagonist named Minami who is also from the Hashimoto family who turned out to be Sayaka's older sister who has a soothing skill, meals she cooked could ease all tiredness, meaning she has healing in cooking, leading him and Minami to become a perfect loving couple. She wanted him to have kids with Minami's younger sister Sayaka one day not long after he marries her. But that was thwarted however when she heard that they were childhood friends, meaning they made a promise to get married when they're older. So her dreams didn't came true the moment Minami got married to him on their wedding night. But just five hours after the wedding, his mom Kanako beated her up by punching her so hard, but quickly stopped at what she was doing. Only then did she understood her promises and cried. All she wanted was answers from Masashi. But the reason why he always chose Minami was because Sayaka was 18 and that she was too young to marry anyone. What happens next?