Taishi Fura, a former baseball player who became a delinquent, accidentally sees the man-eating "ghoul" known as Lantern injuring his old friend and killing another. Before things get worse, Fura's classmate Kishou Arima arrives—since he is actually an undercover investigator for the Commission of Counter Ghoul (CCG)—and forces the ghoul to flee. Seeking revenge for his friends, Fura teams up with Arima to hunt down ghouls in the 13th Ward, with the ultimate goal of taking down Lantern. Tokyo Ghoul: "Jack" reveals glimpses into the past life of the CCG's fearsome "Reaper," Arima, offering insight into how he spent his high school years.