The official Heroes Alliance has issued a trailer, which is a mysterious book, predicting the upcoming launch of a new auxiliary hero. It seems that the tubing owner who was invited to test accidentally uploaded the video ahead of time. Although the video was deleted in seconds, the thumbnails show us the shape and skill icons of the new hero. The new hero, named "Yuumi" in English, looks like a very budding cat and sits on a flying book. From every point of view, the cat is very likely to be a new hero.