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Te mysterious lifeform Oochopus appears at the house of five-year-old Kantarou and three-year-old An-chan. Kantarou and An-chan accept the cute but somewhat irresponsible Oochopus as family.
Michi and her parents have just move into the Happiness House, a bizarre neighborhood built atop a giant tree. As Michi ventures into her new room, a strange nut falls from one of the tree branches on the ceiling, revealing a small creature inside called Nanami-chan. The two quickly become good friends and begin to explore the Happiness House, discovering its secrets, meeting the neighbors, and teaching Nanami about the world, from daifuku to astronomy.
With no apparent reason, Kakuremomojiri and other Chobittos suddenly start a journey looking for a legendary peach known as "Rainbow Peach."