The entirety of Sion and Nezumi breaking into the correctional facility. Sheer awesomeness and action ensues.
In chapter 6 a random guy comes up to Sion and hits on him saying "You're very pretty like a doll." He offers Sion meat and drink and clearly has bad intentions so Sion initiates the Groin Attack on him to get away.
In the manga chapter 17 before they break into the correctional facility Nezumi declares to Shion "We're going to hell together...But we're coming back alive."