 If you liked
Aishiteruze Baby★★
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 ...then you might like
Himawari Youchien Monogatari: Aiko desho!
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Both involve a teenage guy having to take care of kinder-garden children. And both have a kinder-garden girl who is very attached to them.
Aishiteruze Baby is a guy and a kinder-garden girl + another teenage girl.
Aiko Desho!? features the guy working at a kinder-garden, and the kinder-garden girl attends that school as well.