Description: Rimuru and his friends go to the "Magic Tower", a place where magic from all over the world gathers to develop new special moves, and they are supposed to be busy with their research, but they get caught up in a conflict...Official Website, translated- Adapted from a new webnovel written by Fuse in celebration of the 10th anniversary of Tensura.- The story takes place between volumes 9 and 10 of the LN.