Your blood type determines your personality, and this show treats that pseudoscience with the deadpan commitment of a documentary. Four faceless blobs argue about themselves for twelve minutes at a time, which sounds boring until you realize the joke is that they're all kind of right and also completely wrong simultaneously. It's the kind of show that only works if you've heard someone actually defend blood type personality theory in a conversation, and then it becomes comedy gold about how easily people believe in systems that feel true.

Four faceless, nameless characters each stand in for one blood type and the stereotypes attached to it in Japan and Korea. The short gag comedy asks whether A Types really are kind but indecisive, whether O Types are more passionate and childish than everyone else, and how anyone gets along with an AB Type, testing these popular beliefs in romantic and leisurely situations. The anime adapts the Japanese remake of the Korean webtoon A Simple Thinking about Bloodtypes, packed into twelve brief episodes.