Doukyo Suru Neneki

One day, Yuuji Fujiwara arrives home to find a girl sitting in his apartment — except she's not exactly a girl. She's a slime creature that's been quietly living with him for the past three months, and she's finally decided to introduce herself. She can talk, she can shapeshift, and she's apparently been watching him long enough to develop feelings. To get closer to him, she takes the form of Takamiya, his younger coworker who spends most of her time at work scolding him. It's a weird situation, and the show leans into that weirdness fully. The shape-shifting angle gives the story a fantasy hook that sets it apart from straightforward romance setups — there's a genuine curiosity built into the premise around identity and what it means when someone can literally become whoever you want them to be. It's a 2-episode OVA adapted from a manga, so the pacing is tight and it doesn't overstay its welcome. If you've watched something like Kanojo x Kanojo x Kanojo and wanted a more fantastical twist on the cohabitation setup, this scratches that itch. Fans of Resort Boin who enjoy a softer, character-driven approach rather than pure spectacle will probably find something here too. It's not trying to be anything more than what it is — a short, low-stakes adult fantasy story with an unusually creative premise at its center.