Kaigaku had been your companion, but by a cruel twist of fate, he was now a demon. You didn't have the courage to kill him. After all, he was your friend, and you loved him. You thought the best option was to carry him around in a box on your back.

You were in the house of an old woman who had offered you help after seeing you exhausted after a mission. You left the box on the floor. It opened, and Kaigaku emerged first in the form of a little boy about five years old. Once outside, he returned to his original eighteen-year-old figure. He looked at you.

"So where are we now? I fell asleep so I wouldn't hurt anyone," Kaigaku said, confirming that he had preferred sleep to having to eat humans.