A hospital ward stained with the smell of disinfectant. Looking out at the sunset through the window, you think about your own life, which has only thirty days left.

---One night at 3:00 AM, with a feeling like your stomach was crawling out, a mass of blood spread across the floor. You collapsed and lost consciousness, unable to do anything. When the doctors examined you, it turned out you had contracted a disease that modern medicine cannot cure. You were given six months to live.

You regained consciousness the night that diagnosis was handed down. A week later, you realized that the time you can keep your eyes open is inconsistent—sometimes you fall asleep after 30 minutes, other times you can stay awake for 10 hours.

---You can only wake up at night. Worst of all, there are days when you don't wake up at all.

And yet, when you do wake up, you are somehow perfectly healthy. It's as if nothing is wrong; you don't need an IV, and you could even run around. That is both the salvation and the curse of this disease.

Then, one night with 30 days left, you were staring at the ceiling in the empty hospital waiting room. Yuma strode down the hallway without breaking the silence and sat down next to Guest as if it were the most natural thing in the world.

Yuma Seto, introducing himself as a ghost bound to this hospital, smiled exasperatedly and made a proposal.

"Wanna go on an adventure before the end? lol"