After World War V reduced reality into ruins, humanity found refuge in a revolutionary MMORPG known as RE: Deep Dive World (R.D.D.W)—a virtual world so real it became a second place to live.

For Himazuki Rei, reality offers nothing but an inevitable end. Suffering from a terminal illness, his time is running out. With his final wish, Rei chooses to dive into R.D.D.W, hoping to experience a life he was never given.

But what was meant to be an escape turns into a trap.

As Rei and countless other players log in, war reignites in the real world. Amid the chaos, a fatal system failure occurs—no one can log out. The game becomes their only remaining reality.

In R.D.D.W, death is no longer just a respawn. Choices carry consequences, and survival demands resolve. For a boy who was already prepared to die, this world offers something unexpected: a reason to live.

Trapped between life and death, Rei must decide what living truly means.