Upon his arrival, Diablo meets a young girl named Rem, who is a slave. He also meets Shera, a knight who is on a quest to rescue her sister. Diablo decides to use his powers to rescue Shera's sister and, in the process, becomes involved in a complex web of politics and magic.

, a socially anxious gamer who is summoned into his favorite MMORPG, Cross Reverie , as his high-level character, Manga Volume 20