Aiyou is a second-grade elementary school student—lively, mischievous, but kind-hearted. Though his playful antics often cause trouble for his teachers and classmates, he is well-liked by everyone. His good friend "Heipi" is a Boston Terrier—straightforward, clever, agile, loyal, confident, and full of a sense of justice. Together, they take on Dr. Bond, who spends all day dreaming of striking it rich. Whenever Aiyou and his little friends run into trouble, Heipi heads to the convenience store filled with magical gadgets and pulls out all sorts of wondrous tools to help them out. However, Aiyou, being the playful and mischievous little guy he is, often ends up causing even more trouble by overusing these magical gadgets.