This series has good potential, but too bad it ended suddenly. The world building is interesting and fresh, hinting with many realms of God from different cultures, yet as far as the story goes, we could only get to see 2 of them, which really is sucks. If it gets broaden, I think we could have a world similar to that of Magi. There's not much long action scene, but it was quite engaging as it became a mass fighting. The fighting system hasn't been well explained yet and has so many rooms for potential update. The character design is quite fresh compares to what I'veread recently. They all have an underlying consistency, which is nice once the casts stand together. Btw, I like Hel's design best, then the Giants.
Overall, I think it's a nice manga to read when you're tired of those cliche screaming action shounen. The only downside is that it ended too soon.