 If you liked
Narutaru: Mukuro Naru Hoshi Tama Taru Ko
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 ...then you might like
Milk Closet
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Both are cute, but dark, and depict a particular kind of violence. Narutaru is deeper, has more mature themes, and is more focused on interactions. Milk Closet is more straightforward and the children are younger so several issues from Narutaru don't feature here at all.