In a massively popular VRMMO, Naoki starts playing at his younger brother’s request, casually enjoying the game as a tank. However, when a mysterious developer traps half the players inside—turning in-game death into real-world death—Naoki’s brother is among them. Determined to save him, Naoki ventures into the perilous virtual world. When he faces a deadly monster with only 1 HP left, he discovers a hidden, overpowered skill within his tank class—one that could change everything.