
I think this is somewhat the same as the Sex therapist (?) where he help them find confidence for their love BUT here sex = finding confidence to yourself. but the difference is that the main character Minori have a love history :3

Unrequited love, infatuation, crush, that sorta thing. Especially considering the doctor doesn't expect anything of him as a yakuza, unlike everyone else in his life.

the guy with the glasses is another client .. while the guy with the short black hair knew the doc from the past and they had a relationship but it seemed it went wrong at one point and the doc apparently ran away it all makes sense in the last pages
but it seems like it will turn out well as we see in the spin off the yakuza guy is heart broken because the doc disappeared and was in longer in the clinic .. that will explain some stuff (⌒▽⌒)
How are the two connected. It makes it seem like the chiropractor and the 4th Yakuza were in a relationship? Did the guy with the glasses also have sex with the chiropractor.