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A normal physician by day, a shady unlicensed surgeon by night. Kazumasa takes care of the health of his community by day, but he also serves as the head medic for Takayuki's group. Kazumasa is a tense and neurotic person, to the point where several locks of his hair have turned white due to stress. He always says he hates troublesome things, but he has a hard time saying no to others, particularly those who are suffering. He has a special soft spot for animals, particularly kittens, and often feeds the strays that come by his clinic.Though he started as just a doctor, his longtime affiliation and friendship with Takayuki resulted in Kazumasa reluctantly joining his group. Though Kazumasa isn't particularly strong, he is an efficient fighter who targets weak points. He arms himself with a myriad of scalpels and syringes hidden inside his coat.
Kazumasa and Takayuki are childhood friends. Kazumasa grew up treating the woundsd Takayuki sustained in fights. Kazumasa reluctantly joined Takayuki's group since he wanted to keep an eye on his old friend. He often berates Takayuki for his poor lifestyle choices. He is good friends with Takayuki's partner, Ukyo and often babysits their daughter.
Kazumasa and Tatsuya first met when Kazumasa saved Tatsuya after he was shot by a gunman seeking revenge. Being a soft-hearted doctor, Kazumasa treated his wounds and nursed him back to health. Kazumasa thought that was the end of the situation, but Tatsuya eventally found his way back to Kazumasa in order to thank him for saving him. They ended up getting along very well and eventually end up falling in love.