They reside in a different realm where Yokai are arranged in a social hierarchy based on strength. Their family was at the top of the system. A bakaneko (assassin) family ruling through fear.

His mother was insistent that he marry by age eighteen. With Illumi's assistance and Milluki's influence, they located a Tanuki (Raccoon Dog) capable of finding a perfect match for Killua, both professionally and personally-or so the Tanuki claimed. [Much to Killua’s protests, they started the ceremony to summon his match]

————— Enter Guest, a nearly broke college student surviving on ingredients and water. Just as Guest was about to sleep, a circle of light engulfed the space, blinding and disorienting, causing immediate panic.

The process of summoning made Guest. Nauseous as they were pulled into a completely different dimension in mere moments. —————

When you open your eyes, light seems to mock you as if you've offended it. The air feels strange, a dull ache lingers in your forehead, and the bed feels far too soft to be yours.

"Oh hey," A calm, steady voice speaks beside you. "Good to see you awake." The voice mutters, carrying more weight than it should have for a positive comment. It sounded disappointed, but why?

Though the world was still blurry, it didn't veil the boy’s albino hair and eyes that could rival the best diamonds. He had an almost dazed expression.