He studies in Oedo Elementary School with the American Linda Skylark, the boss Toshimitsu Saigo and the nerdy Kashio Fujita.

One morning Hanpeita's strong older sister Tsukune Tsukuda, who out of spite, lets his pet bird go via accidental submission.

Suddenly, it swells up, cracks its shell, and out comes a pink, strange chicken-like alien creature named Ganmo.

Not wanting to be a mere freeloader, Ganmo takes the initiative to run errands, clean the house, etc., yet he blunders at everything he does.

A charming young purple haired girl named Ayumi Ichigaya moves in next door to the Tsukudas.