Kingdom of Knightwalker

The Kingdom of Knightwalker (士の王国 Naitowōkā no Ōkoku), also known as Knightwalker (士 Naitowōkā), is a sovereign state ruled by the House of Knightwalker.

Etymology
士 Shi is Japanese for "samurai." However, it appears to come from 騎士 Kishi, which is Japanese for "knight."