Living in Japan with his thrifty parents, young Hagemaru Hageda, a fourth-grade student, navigates a world where saving every penny is a way of life. Alongside his outspoken pet dog, Pesu, who often critiques the family's frugality, Hagemaru cherishes his friendship with Masaru Kondo and harbors a crush on Midori, a fellow classmate. The series unfolds with Hagemaru's daily school adventures, centered around his teacher, close friends, and humorous escapades. Each episode culminates with a glimpse of the top ten moments, capturing the essence of Hagemaru's mischievous yet endearing world.