The Inescapable March by Hana Carolina

Arran, a widely feared warrior-mage who can manipulate time and space, and his best friend, Hyacinth, an almost-famous actor and talented singer adored by (too) many, find themselves trapped in a recurring nightmare ending with their deaths. Separated amid a blood-soaked war, they keep meeting again, lost in a hazy space between winter and spring, dream and reality, friendship and love.