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The ML dates an older woman (his tutor) in high school, She suddenly tells him she has to go away and he pines for her for years sending her letters that are continuously returned. He finds out she dies and that she gave birth to his daughter. His ex's Mother asks him to take in the daughter to see if he can raise her.
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Both have male leads who are single daddies. Both leads are from Sutato agency, the black rangers of their respective groups, Snow Man’s Meguro Ren (member color: black) and SixTONES’ Matsumura Hokuto (member color: black). Plot wise, well, very different. With Umi no, you’d probably cry every episode. With Sionji-san, it’s a total laugh trip. I’m still watching episode 2 but it’s really funny. It’s a good balance.
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