"Who gave you this pendant? Do you cherish it so much?"
"... Is a very important person."
"Best friend? Lover? Relative?"
"Best friends are not enough to summarize, lovers are too narrow-minded, and relatives are ambiguous... But they are the most indispensable people in my life."
"Then your relationship is quite messy."
"Shut up, you."
――――――――――――――――――
This is after the end of the world. The writer, the doctor and the killer travel together, but after their trip ends, the writer is trapped, the doctor disappears, and only the amnesiac killer is left back to the origin.
Purpose: Support each other with important people