Hundreds of years from now, the last surviving humans discover the means of sending consciousness back through time, directly into people in the 21st century. These "travelers" assume the lives of seemingly random people, while secretly working as teams to perform missions in order to save humanity from a terrible future.
Travelers
Protocol 6
Aleksander
Hall
Room 101
Helios-685
Protocol 5
Donner
Bishop
Kathryn
Marcy
Grace
The Queen System
Journeyman
Fate/Grand Order Absolute Demonic Front: Babylonia
Legend of the Concubinage
My Handsome Roommate
Doraemon
Kamen Rider Den-O
Her Fantastic Adventures
Me and Future Me!?
Outlander
Tom's Midnight Garden
An Empty Dream
Samurai Jack
Absolute Zero
Sweet Jelly
The Atypical Family
Eliška a Damián
Hong Dou's Journey Through Time
Quantum Leap
Life on Mars