A creature hatches from a nut in your new bedroom, and suddenly the massive tree-house you're living in stops feeling like a move and starts feeling like coming home. Every episode adds another weird little neighbor, another corner of the Happiness House that shouldn't work but does, another reason to stay. It's the kind of show that doesn't build toward anything except the next quiet morning with a friend who literally came from nowhere and somehow became everything.
Michi's family has relocated to the Happiness House, an enormous tree hollowed out and converted into a sprawling apartment complex filled with quirky neighbors and winding passages. While unpacking in her new room, Michi discovers a peculiar object that soon cracks open, revealing Nanami-chan, a small creature with no clear origin or purpose. The two quickly bond and become inseparable companions. As they navigate their strange new home together, Michi and Nanami-chan encounter an endless parade of eccentric residents, each bringing their own brand of chaos and charm to daily life. What starts as a simple friendship between girl and mystery creature evolves into a series of everyday adventures, where the ordinary rules of the Happiness House are constantly bent in unexpected directions. The show trades in gentle humor and absurdist situations, finding comedy in the contrast between Michi's attempts to understand her bizarre surroundings and Nanami-chan's innocent reactions to everything. Viewers looking for lighthearted comedy rooted in childhood wonder and surreal domestic situations will find plenty to appreciate here.