 If you liked
Papa no Iukoto wo Kikinasai!
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 ...then you might like
Uchi no Ko no Tame naraba, Ore wa Moshikashitara Maou mo Taoseru kamo Shirenai.
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In both, the protagonist adopts one or more orphan girls despite not having any experience as a father.
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Recommended by Patata_Otaku
Both feature a young male protagonist who adopts children who recently become an orphan.
Both tried their best to give their children lives as normal as possible.
Both are quite heart-warming series.
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Recommended by TheRockzSG