A high school boy who sees romance flags hovering over every girl around him, except he's terrified of actually catching feelings because of trauma, and then four of them move into his dorm anyway. The show knows its premise is absurd and leans into it, treating the flag mechanic like a real system that breaks down the moment actual emotions show up. By the final episode it explains what the flags actually are, which means every joke about love at first sight suddenly means something different. This is harem anime that refuses to pretend its own setup doesn't matter.
Sota can see flags floating above people's heads: visual markers of what's about to happen to them. A death flag means danger is coming. A romance flag means love will bloom. It's a strange gift that should make life easier, but Sota uses it to stay isolated, terrified of the connections that nearly killed him years ago in a shipping accident. Then four girls show up at his dorm room with zero intention of leaving. They're curious about him, persistent, and completely unafraid to force their way into his carefully controlled world. As they move in and refuse to take hints, Sota's perfectly orchestrated solitude collapses. What unfolds is a chaotic comedy about a guy who can predict every romantic possibility but can't stop it from happening anyway. The flags keep multiplying, the girls keep pushing closer, and Sota has to figure out if seeing the future means he actually understands what's coming at all.