Isekai no Senshi Toshite Kuni ni Manekareta Kedo, Kotowatte Heishi Kara Hajimeru Koto ni Shita

Ordinary high schooler Yukikazu Totsuka suddenly finds his life turned upside down when he's transported to another universe — along with his whole class! While his classmates are hailed as heroes and appointed warriors in the new world, Yukikazu chooses to follow a different path: starting from the ground up as a humble military recruit. Can he climb the ranks, survive life as a soldier, and find out the truth behind this mysterious summoning? (Source: Mangamo)