His Majesty The Demon King's Housekeeper Volume. 8

DEEP DIVE INTO DESIRESSakura’s newest adventure has her heading to the underwater Mermaid’s Domain, where she must find King Emelda a pearl with anti-aging properties. But the Mermaid Queen becomes smitten with Sakura, and the housekeeping saint finds herself trapped underwater with a fishtail! It’s up to the Demon King to dive to her rescue. Will this deep water adventure finally make Sakura realize her deep seated feelings?