Tokyo Revengers is a Japanese manga series written and illustrated by Ken Wakui. It has been serialized in Kodansha's Weekly Shōnen Magazine since March 2017
A 26-year-old freeter named Takemichi Hanagaki discovers one day that Hinata Tachibana and her younger brother Naoto had been murdered by the Tokyo Manji Gang.
Takemichi teleports to 2005 exactly 12 years in the past when he is shoved in front of a train. Takemichi visits with Naoto while reliving his middle school days
As soon as they shake hands, Takemichi is abruptly flung back in time, causing a temporal paradox in which Naoto lives and becomes a detective.
When Takemichi arrives in the present, he discovers that Hinata and his companions continue to perish according to the current chronology.
Takemichi returns to the past with just the knowledge that Tetta Kisaki turned the Tokyo Manji Gang into a violent group.
Kisaki has just joined the gang and is utilising Pah-absence chin's to become the new captain of his division.