I find this manga just really boring, it's just about the yakuza guy obsessing over the girl and there's nothing interesting really going on. No plot, no comedy, no action, no romance, it doesn't really have anything interesting besides the guy tailing her and the girl just telling him to screw off cause he's a degenerate LOL
Nothing wrong with the ML being a psycho, it would actually be an interesting part of the story if he actually did something besides tail her. He doesn't actively do anything, not even trying to get her to like him back, so every chapter literally feels the exact same.