This anime adapt the latest game update (Ain's update), at the same time the story take place from Hamel Arc. So if you guys (the non-player) wondering about the previous story, just read it (webcomics) at Elwiki/watch it (every cutscenes from the game) at youtube or from the very game. The cutscene itself tells you guys from the beginning of the story until the latest story that have been made. So don't watch the anime if you don't understand the story :v But whatever... it's your own choice. EDIT: For you guys who want to see the anime but can't find it in any website, just watch iton 2nafish channel on youtube.

SPOILER (?)
Okay then, the story itself seems to be from the video that tells about Ain, but from different perspective and some editing. Well, seeing the first episode made me realize that the start of this anime is from the Hamel Dungeon Quest. It's cool tho. I like how they immediately engaging a fight and................ wait, is this a spoiler? :v