Free Travel in the Apocalypse, Starting with Two Beautiful Neighbors

An 18-year-old boy who suffered psychological trauma saved someone from drowning by a river... When I woke up, I found that the world had become strange, and there was no one I knew around me... The self in the mirror actually changed from eighteen to twenty-eight... Whether it's rebirth, time travel, or amnesia, since you're alive, don't live in frustration! Yearning for freedom, yearning for freedom and freedom, yearning for doing whatever you want. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.