Movie
Description
Tsuyoshi Igawa serves as the narrative's central character. He lives with his parents, Yoshiko and Hideo, and his two older sisters, Keiko and Noriko. With his father often away on business trips, Tsuyoshi manages household duties due to his mother and sisters' lack of domestic skills.

Despite a "Dumb Jock" reputation focused on athletics, Tsuyoshi demonstrates unexpected academic competence, achieving high scores on the Japanese National Center Test for University Admissions. His domestic abilities invert traditional gender roles; he excels at cooking and cleaning, compensating for his family's deficiencies.

Tsuyoshi endures physical and verbal mistreatment from his mother and sisters, often becoming an unintended target of their frustration, including hitting, ear-pulling, and neglect. This contrasts with the kindness shown toward his sisters, as his mother exhibits clear favoritism. Nevertheless, he consistently displays unwavering loyalty and kindness, assisting his family without expectation of gratitude. This persistent support gradually reduces the bullying he receives.

His compassionate nature extends beyond his family; he interacts patiently and respectfully with neighborhood children, earning their affection and trust, contrasting with adult perceptions. His friend Tsukasa involves him in schemes, such as attempting to procure Keiko's underwear for profit, highlighting Tsuyoshi's occasional participation in dubious activities.

In the series conclusion, Tsuyoshi marries Mai Ishikawa, a relationship his father supports. The sequel manga confirms their stable marriage, the birth of their twins, and a fulfilling family life. His character arc culminates in overcoming academic challenges, gaining university admission, and achieving personal happiness.

The time machine movie spin-off features Tsuyoshi and Tsukasa accidentally traveling twelve years into the past. There, they encounter their younger selves and discover Yoshiko was gentler and Noriko less aggressive in their youth. The plot involves retrieving a stolen power crystal from young Keiko to return to their timeline.