 If you liked
Rinne no Lagrange Season 2
|
 ...then you might like
Suisei no Gargantia
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Both of these anime (even though the rinne im recommending is season 2 i suggest both of them) are a big part of forming bonds and friendship with people that are different. They are both also set on planets that are mostly water. Both anime have mecha.
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Recommended by lovelydeath