Mao the Demon Lord of the School & Welcome to Demon School! Iruma-kun - Weekly Shonen Champion Cover & Lead Color Page. Mao the Demon Lord of the School & Welcome to Demon School! Iruma-kun - Cover - Lead Color Page Cut from Weekly Shonen Champion. Since this is a amateur cut-out, the cutting may be rough and may exceed the acceptable range for some people. Also, there are a few pages that are folded or warped during the cutting process. Please be aware of this.