Michi and her family have just moved into the Happiness House, a vast tree that hosts a variety of small buildings and homes built on and inside its branches. While exploring what will become her new bedroom, Michi discovers an odd, nut‑shaped object. Soon, a peculiar creature, Nanami‑chan, hatches from it. The two quickly become friends, and together they learn new things while meeting an array of eccentric residents each day.
