A Middle-Aged Salaryman at the Bottom of Society: Declared Terminally Ill, He Chooses to Die in an SSS-Class Dungeon… Only to Fuse with the Ultimate Legendary Monster and Become an Incredible Powerhouse!

Native title: 社会の底辺に沈む中年社畜おじさん、末期の病を宣告されSSS級ダンジョンで死を選んだところ……最強の伝説モンスターと融合し、超絶強者となる！