In the Eternity Devil arc, Special Division 4 is sent into a hotel to kill the Eternity Devil who is said to reside in an hotel. After realizing that they are trapped in there, the team falls into disarray. The devil offers to release them if they feed Denji to him. Kobeni attempts to kill Denji to accept the Eternity Devil's offer, but fails. Finally, the devil was defeated when Denji jumping straight into its mouth, sawing through its flesh, finding its heart and destroying it.