In Tokyo Ghoul: Jack, an incident involving a human-devouring Ghoul occurs in Tokyo's 13th Ward. To seek the truth behind what happened to his friend, the rebellious high school boy Taishi Fura pursues the Ghoul named Lantern with the young ace investigator Kishō Arima. The story follows how the ace investigator Arima and the talented 7th Ward investigator Taishi Fura first met.

[Source: Anime News Network]