After settling into the Happiness House, a colossal tree adorned with mini abodes, Michi and her kin discovered their new dwelling. While inspecting her bedroom, Michi stumbled upon a peculiar nut-shaped item. Eventually, a peculiar creature, Nanami-chan, emerged from the object. In no time, the two developed a strong bond. Collaboratively, Michi and Nanami-chan learned various novel concepts and frequently encountered the peculiar inhabitants of the Happiness House.