 If you liked
Aiso Tsukashi
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 ...then you might like
Usagi Otoko Tora Otoko
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Both are yaoi mangas where the seme is either in or was former yakuza. Usagi Otoko Tora Otoko is the lighter of the two since the uke is la bit more innocent. Both also have cute resemblance to animals (UOTO - Rabbit and Tigers/ AT - Cats) and also real cute moments as well.