Saikin no Jinrui wa Maou wo Nameteiru

Sei Miyako, a shogi-loving high school student who is attacked and killed by a robber at his part-time job, is reincarnated as the Demon Lord. A unique fantasy illustrating the fierce battle between a young genius who faces the approaching adversity with a tactical eye honed through shogi, and the strategist, Riol, who challenges him for the survival of humanity.

(Source: DigiCata Henshuubu, translated)