Onigiri

Zenki is protecting his village when two girls, Shizuku and Yoshitsune, come along to ask him to come track down and kill the "god-eater." Shizuku and Yoshitsune both have their own skills, but they're looking for a capable fighter to join them. Zenki ends up going with them, and they encounter more allies and enemies on their way.

(Source: MangaHelpers)

Onigiri is an adaptation of CyberStep's MMORPG game of the same title.