A somewhat serious girl who is best friends with Boy. She has experienced great hardships in a mysterious world. An enigmatic girl.

A cool-headed boy who loves to fight. He adapts to anything and has a tan.

A very serious boy who, despite being an introvert, is a reliable member of the group.

The student council president of the academy. She is incredibly cute, loved by everyone, and loves all things cute.

A boy who loves camping and tries to limit his gaming time. He is top-class and loves having fun.

The vice-president of the student council. He is often called handsome and is a boy who moves at his own pace.

A girl with a strong personality who frequently goes to her part-time job.

A relaxed girl who keeps a Smallfry as a pet and often wears winter clothes.

Her true identity is unknown, but as her name suggests, she is an expert with machinery. In footage, she is seen wearing a mechanical ink tank. Originally a helicopter mechanic and pilot, she was flying the Deep Cut crew to the Uzushio Islands for an adventure. However, the helicopter made an emergency landing on the island, leaving her stranded with them. A month later, she joins Deep Cut on their treasure hunt to explore the island. "Mechanic" is a nickname, not her real name. It was given to her because of her mechanical prowess. Using her technical skills, she patches together various scraps to build gadgets and equipment necessary for the island adventure, as well as the Hideout Ship that serves as their base. A girl who is exceptionally good at building things.

They support the Mechanic by riding in research mechs. The members of Deep Cut are Shiver, Frye, and Big Man. Shiver: Female, enjoys fishing. Frye: Female, helps with building. Big Man: Unknown gender, provides novels, strategies, and advice.