An Entangled Summon?! And I'm a "God” Now??

Takumi Saiki has retired from work and is living a life free from care, when he finds he's been summoned to another world. He is one of four people brought as heroes through a secret ceremony and tasked with defeating an invading army of the Demon Lord. There's a "Hero," a "Sage," a "Priestess"... and Takumi's... a "God?"

Source: Alpha Manga