A yakuza falls for a doctor. Also with personification of animals.
Story:
A doctor (Uzuki) goes home from a night shift. He comes across a dude with a bullet wound and a cat sitting next to him. The doc takes care of him on the street and leaves cause the injured guy (Nonami) told him so. The next day Nonami enters a hostpital Uzuki works at. It turns out that Nonami's a yakuza (Uzuki had a suspision anyway) and he's looking for "Suzuki" aka the person who saved him - he was injured and had "black vision". But he thinks that it was a woman so he's searching for her. Nonami found out that it was Uzuki which pissed him off at first but then he goes for it. Then there's a lot of yakuza politics which involves a substitute as Nonami's lover and so on. In the end they end up together.
Usagi Otoko Tora Otoko