As much as I've enjoyed it (I must admit that it was a pleasant surprise), I think the ending leaves an open door for a sequel. For example, the issue of Yujin's "death". I know Haru has said He will do will do everything in his power to try to bring him back (and maybe he will succeed one day), but I'd like to see how he will make it. What do you think? I think they could make a sequel set a few years later (2-3 years) with Haru and the others trying to bring Yujin back and face a new enemy. After all, they've made one to Xros Wars and there wasn't any need for it.