 If you liked
MeruPuri: Märchen☆Prince
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 ...then you might like
Kimi wa Boku no Mono
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They are both about a younger guy and an older girl and how they have problems in their relationship.In both of them the girl already has someone she loves and them the younger boy shows up. In Kimi wa Boku no Mono the boy is 12, but in MeruPuri: Marchen Prince he is even younger then that.