Tokyo Ghoul Re Vol 14

Kaneki was mortally wounded in the CCG attack on the Goat stronghold, and in his desperation to see Touka again, he gorges himself on the bodies of the Oggai. The sudden ingestion of this unusual fuel forces Kaneki into a terrible metamorphosis, the result of which poses a stark new threat to Ghouls and humans alike. Will Kaneki’s degradation be what finally brings the two sides of this ancient war together? -- VIZ Media