A half-dragon kid trying to hide her literal fire-breathing in a normal Japanese school is the setup, but the show knows the real joke is how mundane her problems actually are. Ruri's supernatural heritage matters less than whether she can eat lunch without singeing her desk or talk to a crush without accidentally scorching him. It's warm enough to actually make you smile, the kind of comedy that doesn't need anything to go explosively wrong because the everyday friction between dragon biology and teenage life does all the work.
Ruri's got a secret that's about to get very hard to hide. She's half-dragon, a fact her mother casually dropped on her years ago alongside the confession that yes, her dad is literally a dragon. For the most part, Ruri manages to blend in at school like any other girl, keeping her heritage under wraps and pretending her occasional fire-breathing incidents are just bad digestion. That plan falls apart spectacularly when her draconic side decides to make an appearance at the worst possible moment: smack in the middle of class. Now Ruri's scrambling to manage an increasingly chaotic situation where her supernatural nature keeps threatening to blow her cover in increasingly ridiculous ways. Her classmates grow more suspicious by the day, her teachers have no idea what's actually going on, and her body's got other plans entirely. What follows is comedy born from the collision between ordinary teenage life and the very unusual fact that Ruri's genetics include actual fire-breathing monsters. Staying under the radar gets harder by the episode.