His Majesty the Demon King's Housekeeper manga volume 6 features story by Saiko Wadori and art by Mika Kajiyama.

Sakura and the gang are back in the Demon Realm! There's no time to rest, though. The southernmost part of the Demon Realm may have the key to restoring demons' cleaning magic. Everyone sets sail to the demon jungles in the south. None of them know what awaits them. Sakura especially didn't expect to find seeds of affection growing in her heart for the Demon King.