 If you liked
Udon no Kuni no Kiniro Kemari
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 ...then you might like
Somali to Mori no Kamisama
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Heartwarming story about a father figure and a child, which is (not) a human, thus he/she needs to hide his/her identity.
The story is a bit similar whereas a man found himself in a situation wherein he has to take care a child and somewhat in a supernatural setting.
Both are heartwarming and fluffy.