Mashle: Magic and Muscles Vol. 18 by Hajime Komoto

Innocent Zero has exceeded the limits of human existence and become a god! Humanity has no choice but to bow down before his awe-inspiring divinity. Except for Mash, whose muscles have unlocked an unimaginable power to give Innocent Zero a flick to the forehead he won't soon forget! But Innocent Zero still has the magic of darkness and time on his side. With Mash being all that stands between the survival and destruction of humanity, will the people rally to his side at last?