The Maid of a Princess

Keiko Hiro is your typical overpowered, orphan, demihuman. He spent most of his days exploring the land of Geatree while stealing whatever his heart desired, well... that was the case. After being captured by the guards of the Zaria Kingdom, Keiko is bound by a slave collar and forced into becoming the Princess's Royal Maid, causing him to unlock an unknown power that can only be activated by... Kissing the princess!
Keiko, along with Princess Valentina set out on a journey to expose the truth behind the random mythical beast appearing on the outskirts of the Zaria kingdom.
Their first quest - Slay a dragon!