Pe-chan is an infant endowed with supernatural abilities, including telekinesis that levitates objects and the power to animate inanimate entities like stuffed animals.

Born to fashion designer Maki Kano and novelist Takashi Kano, Pe-chan lives with them and their household maid. The infant's powers trigger unusual behavior in toys and animals, though these manifestations escape parental notice. Daily existence revolves around generating chaotic scenarios through these abilities, primarily disrupting the au pair Mon-Mon Hanamura, who provides care.

Pe-chan develops a profound attachment to Mon-Mon. When Mon-Mon resolves to leave her position, the infant employs supernatural intervention to thwart her departure, cementing her presence in the household. This act reveals both the intensity of Pe-chan's bond and a calculated application of powers to alter events.