This is a Nyaruko side story that leans fully into the comedy without the anime's restraint. A single OVA episode that understands the joke is funnier when it commits completely instead of cutting away. If you've watched the series and wondered what would happen if they stopped holding back, this is the answer.
Mahiro's life takes a chaotic turn when Nyaruko, a shapeshifting alien deity, crashes into his world claiming to protect him from cosmic threats. What starts as a claim to safeguard humanity becomes an excuse for her to move in, cook questionable meals, and generally wreak havoc on his carefully ordered existence. The catch: these interdimensional enemies she warns about might be real, or they might be figments of her elaborate schemes to keep him close. This OVA strips away pretense and goes straight for absurdist humor. Nyaruko bounces between genuinely dangerous and utterly ridiculous within the same scene, while Mahiro alternates between exasperation and grudging acceptance. The comedy lands hardest when the show treats its cosmic-horror premise like a sitcom setup, letting the absurdity breathe without winking at the camera too much. If you're drawn to screwball comedies that don't take themselves seriously, twisted takes on cosmic mythology, or characters whose chaos is somehow endearing rather than exhausting, this hits the mark.