Maou Tsukai no Saikyou Shihai Chapter 4 showcases Lewin strengthening his bond with the Demon King of Death, Sasha, as he initiates his quest to subdue all seven demon kings. This chapter highlights his new role as a "Demon King Tamer," using his unique ability to command high-tier demons after being dismissed from the hero's party. The Demon Lord Tamer's Strongest Domination - Nevix