Tomonori is a genuinely unlikeable protagonist, and the show knows it, the comedy lives in watching him get demolished by every situation he creates, especially by the one person whose opinion he can't escape. Rizel's voice acting (Rie Kugimiya at peak deadpan) versus his spiraling panic is the entire engine. At 14 minutes, each episode hits a joke, lands the character moment, and gets out before it wears out its welcome, which means you actually want the next one.
Tomonori is your typical fifteen-year-old boy nursing a crush on his teacher, until she gets engaged and crushes his dreams. He trudges home to find a twelve-year-old girl named Rizel waiting for him with shocking news: the government has legally married them. Things get stranger when he learns Rizel is an artificially engineered human created by a shadowy organization. Her creators strike a deal with his parents: let Rizel stay, and they'll cover years of accumulated debt. Tomonori has no choice but to accept his new wife under one roof. What follows is comedy born from the collision between Tomonori's adolescent embarrassment and Rizel's innocent, childlike wonder at discovering how to live like a normal person. She doesn't understand social boundaries, domestic life, or why her "husband" freaks out constantly. As strange as the premise sounds, the show finds genuine humor and unexpected warmth in their forced cohabitation, mixing sci-fi weirdness with the awkwardness of a teen suddenly responsible for someone who shouldn't exist. It's absurd, it's silly, and it commits fully to its own ridiculous setup.