Let the Party Begin. The much-awaited Battler Party is finally here, and Iruma and the demons of the Magical Apparatus Research Battler are ready to blast the competition away. But when a surprise shakes Babyls to its core and threatens to upend all the festivities, it's up to Iruma and his friends to find the culprit before time runs out. Unfortunately for them, true evil may be lurking closer than they think...

Pages numbered from right to left. Translation of: Mairimashita! Iruma-kun. Originally published in Japanese as Marimashita! Iruma-kun 4 by Akita Publishing Co., Ltd., 2018. Marimashita! Iruma-kun first serialized in Shonen Champion Comics, Akita Publishing Co., Ltd., 2017-. "A Vertical book."--Colophon.