The Ephemeral Scenes of Setsuna's Journey, Vol. 1 (manga)

Setsuna Sugimoto's life is forever changed when he's summoned to another world to be a hero. Changed for the worse, that is, as he's quickly tossed aside because of his weak constitution. Fortunately, a former hero named Kyle gives Setsuna another chance at life by passing on his knowledge and strength.

Thus, Setsuna embarks on a journey to experience this incredible new world.