This is a story of a preserved fish called Mr. Salted Fish who lives at a seafood restaurant on an island and makes a living by working multiple part-time jobs. Due to his unique way of dealing with things, he frequently finds himself in a survival crisis. That's why he takes up a lot of different jobs on the island. In this way, Mr. Salted Fish gets to know the islanders, who are strange at first. But once he learns about their stories, they become friends, and even family. As the annual Fish God Festival approaches, hilarious incidents around Mr. Salted Fish also begin.

SI-VIS is a co-ed music group, led by Yosuke, shaking up the global music scene with their unmatched vocals and performances. However, they are actually heroes in disguise, battling against mysterious forces threatening the world. They convert audience energy at live performances into combat power. Luckily, the battles appear to be ordinary concerts to the public, keeping their identity a secret.