Maple decides to take part in a battle royale event, managing to easily defeat everyone who comes to attack her and winning third place. The next day, Risa joins the game as Sally, a swashbuckler specialising in evasion, and the two go to a cave to fish for materials for a new shield. After Sally finds an underwater cave behind a locked door, the two begin visiting the cave each day to allow Sally to explore the cave and improve her underwater skills, allowing her to defeat the boss and earn her own set of equipment.