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신원: It's a fanmade MSA anime and manhwa.
배경: In Tokyo, Japan, a 28-year-old young woman named Ayane from the Kamishiro family who is orphaned at birth, childhood, adolescence and was cared for by her ailing grandfather named Ryounosuke who is in the hospital due to being diagnosed with chemotherapy and needed a new family, was hired as a physical therapist for an MFC gym for a 26-year-old man who is taller than her but looks older than her named Hayato from the Hayashi family who lives in a penthouse just her because her face and body resembled that of an 22-year-old young woman and not a 28-year-old woman's, making her look younger and a little bit thinner and slimmer. He always has sex with men and women the night before a match tomorrow morning and his routine in the morning was nothing but taking a shower, spray cologne and drink some milk and then leaves for the match after getting dressed properly, making Ayane 2 years older than Hayato. So, when Ayane arrived, she was greeted by the coach named Masashi who has a stocky and muscular body with a fatherly demeanor who is 38 and he introduced the athletes and Hayato to Ayane not long after she told him she was orphaned and needed a new family and Masashi adopted her since his wife died, she can be his new oldest daughter, this was because Masashi never had an oldest daughter of his own and they shouted in excitement and surprise in eagerness, "Nice to meet you!" And one of the athletes in excitement named Takeo said, "She's a lot younger and prettier than we expected." And another named Kaito said, "She's a totally different weight class. Definitely won't be easy." And Masashi told them, "Watch your mouths, boys! Ayane is your new older sister!" It turned out that these 6 athletes taller than her and one is the youngest who is 20 were half brothers from the same father that is their coach Masashi but from different mothers, and the athletes were shocked and said, "Then, how old are you Ayane?" and she said, "I'm twenty-eight." What happens next?