The blackboard of a certain second-year high school class suddenly switched to a display screen. A message appeared: “Welcome to the world of Deep Dungeon,” and they were forcibly made to pull a gacha. It was a harsh otherworldly realm that, while resembling a game, required them to physically fight monsters using the powers obtained from the gacha.

Outside was pitch darkness, and although a path forward was shown, the sudden turn of events caused the classmates to panic. However, the student council president, Sakaki, and the class clown, Kanzaki, took charge, rallying their classmates together and pushing forward with the exploration of Deep Dungeon.

— Meanwhile, Matsui, a loner who remained on the fringes of all this commotion, quietly ventured into the dungeon. Guided by his mundane ability, the “Knowledgeable Dolphin,” which provided him with explanations about the game, he proceeded in solitude. Unlike his classmates, who faced the challenge with grim determination, Matsui advanced at his own leisurely pace, wearing a calm and relaxed expression.

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