So What If I Reincarnate as a Boss from Another World?

He was reincarnated into a different world, appeared at an altitude of 10,000 meters, fell and killed a giant dragon, and inexplicably won the title of Dragon Slaying Hero. The Great Demon King of Gluttony who ruled an area was half-dead with a slap, and was awarded the title of Gluttony Terminator. The Eternal Ascended One, the Arrogant Dominator, the Ghostly Shadow Godslayer of Hell... "Lord Demon King, the brave army outside the city is coming." Facing the seductive succubus who came to report, Dongfang Bai fell into deep thought. He originally wanted to be obscene and develop, but why did he kill a lot of incredible things along the way? Usually it is the brave squad that conquers the Demon King, but it is the brave army that conquers him... What is this, the treatment of the ultimate boss? This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.