Tokyo Revengers: Tenjiku-hen
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 and tells him the precise day he and Hinata would pass away. 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. Naoto surmises that Takemichi travels back in time 12 years each time they hold hands. Takemichi makes a promise to save Hinata using his knowledge from the future.