Slaughterer in Another World

Warning: This novel will depict extreme violence and strong words. There will also be instances of some disturbing scenes that it is recommended not to read this if you are easily offended. Abandon all hope, all ye who enter here. Kogure and his classmates were summoned to another world one day. Just like your typical isekai plot, a king summoned them and yada yada, kill demon lord, blah blah blah and whatever stuff that they want to say. However, there is one big thing that happened that made Kogure unleash the bloodlust that he has been keeping for all these years. Things happened and now, he is standing in front of the demon king's castle. "They think I would want to save this world just because they asked me to? Ha, dream on. Time to begin the conquest and kill everyone who blocks our way. Mercy is only for the weak!"