A creature hatches from a nut in your new bedroom, and suddenly every day in this impossible tree-house is exactly the right amount of strange. The show knows comfort isn't about nothing happening, it's about the right kind of nothing, small discoveries with someone who just got there with you. By episode three you've stopped asking why the Happiness House exists and started noticing how it feels to belong inside it.
Michi's family settles into their quirky new home: the Happiness House, an enormous living tree packed with rooms, structures, and passages built throughout its trunk and branches. While unpacking her bedroom, Michi discovers a mysterious seed-like object that cracks open to reveal Nanami-chan, a tiny creature with big personality and endless curiosity. What starts as an unlikely friendship quickly becomes the heart of daily adventures as the two explore their strange new world together. The Happiness House isn't empty. Around every corner lives someone weirder than the last: residents with unusual habits, peculiar hobbies, and their own stories to tell. Michi and Nanami-chan's days fill with simple discoveries, gentle chaos, and the kind of bonding that happens when you're learning the world alongside someone equally lost. It's cozy rather than chaotic, warm rather than wacky. The comedy comes from character quirks and unexpected moments rather than punchlines, making it ideal for viewers who prefer their humor tied to genuine relationships and oddball charm.