The Mighty Thor, Vol. 1 by Matt Fraction

When Mjolnir chooses an unexpected mortal, the mantle of the thunder god shifts and ignites a collision of divine politics, cosmic enemies, and personal reckoning. The new wielder must rise to face ancient adversaries and modern crises while the former hero grapples with being unworthy, forcing both to confront what it truly means to have power, responsibility, and identity amid bold action and reinvigorated Norse myth.