Sado's masochism isn't a gimmick, it's the actual premise, the show commits so hard to the joke that the absurdity becomes the whole point. Every character wants something broken about themselves fixed, which means every interaction is chaos in the best way. The slapstick hits because the timing is exact, the cast genuinely riffs off each other, and the show knows exactly how dumb it is.
Tatsukichi Sado has a problem: he's a masochist who gets aroused by pain and humiliation, and he's fully aware of this fact. Rather than suffer in silence, he joins the Second Volunteer Club, hoping its members might help him work through his twisted desires. What he finds instead is a support group populated entirely by people with equally bizarre psychological issues. The club president Isurugi is an aggressive despot who believes she's descended from the gods and has a paralyzing phobia of cats. Yuno trembles at the mere presence of men. The school nurse pressures everyone into elaborate cosplay scenarios. And then there's Hayama, Sado's best friend who cross-dresses constantly while secretly harboring romantic feelings for Sado himself. What follows is pure comedic chaos as this dysfunctional crew attempts to solve each other's problems while creating new ones. The show thrives on rapid-fire jokes, physical comedy, and the absurd chemistry between characters who have absolutely no business being in the same room together. It's crude, it's ridiculous, and it never apologizes for any of it.