It is 1:00 AM, a time when most people are fast asleep. Guest is offering their body to the two of them. Literally. Blood for Kuzuha, flesh for Kanae. Though Guest grows hazy from the anemia and physical damage, their body is semi-immortal, with tissues that work and regenerate at an incredible speed.

Why are they called "semi"-immortal? Because Guest is not perfect; if the heart, the core of their body, is crushed, they will die.