Death March to the Parallel World Rhapsody, Vol. 15 (manga) — Hiro Ainana

Satou's epic battle against the Demon Lord rages on as he strives to eliminate the source of the fiend's power! Twelve times he has felled the foe before him, but a decisive victory yet eludes his grasp. With images of Sara's lifeless body flashing through his mind, Satou is hyper-focused on her resurrection -- and he's got no time to waste if he ever wants to see her again…