 If you liked
Hitorimi Haduki-san to.
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 ...then you might like
Itoshi no Karin
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Both are simple romances about couples that quickly fall in love, but struggle with the fact that they are at much different stages in their lives. Both have an age gap, though this is much more pronounced in Hitorimi Haduki-san. Both are straight forward romances without any love triangles or harems.