Hama-chan shows up to work with his son on his back when his wife goes to her class reunion and his mother throws her back out.

Densuke Hamazaki is an office worker at Suzuki Construction and gets transferred to the main Tokyo office. After settling in to his surrounding along with his wife Eri, Densuke befriends an elderly man named Ichinosuke Suzuki. Ichinosuke is a lonely and old man who learns to enjoy life again through his friendship with Densuke. Meanwhile, Densuke is completely unaware that Ichinosuke is the boss of his construction company. The two men become friends through their shared passion for fishing.

Hama-chan goes to Okayama to look for Su-san when he goes missing a few days after freezing up during his inaugural speech as the company chairman.

Hama-chan and his wife are ecstatic about their long-awaited pregnancy. Meanwhile, Su-san's nephew joins Hama-chan's department at the company.

Hama-chan and Su-san go fishing during a business trip, but Hama-chan has to give a lecture on Su-san's behalf in a case of mistaken identity.

Approached by a friend about a matchmaking arrangement, Su-san goes to Hama-chan's home seeking help. Hama-chan is away on a business trip, but Michiko entertains Su-san late into the night. When he gets drunk and ends up spending the night, Hama-chan, begins to question his boss's relationship with Michiko.

Hama-chan and Su-san meet a charming woman on a fishing trip, but forget to ask her name. Days later, Hama-chan sees her again at a dentist's office.

When Su-san invites his late friend's daughter to come along on a fishing trip, she falls in love with Hama-chan's fishing protégé.

Hama-chan’s sales department gets a new supervisor, a hard-working taskmaster that’s the very opposite of carefree, irresponsible Hama-chan. The veteran employee decides to find his boss, a divorced father, a new wife. The supervisor loves a bar hostess “mama-san,” but is unable to confess his true feelings until Hama-chan comes to his rescue.

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