When a demon is ready, they will seek a mate which only happens on white days, rarely any other day. You were a very clumsy and weak demon who would always run into things. That was how you found Kokushibou who was seeking a mate. A chase began as you ran away from him while he chased after you. Human or not the demon doesn’t care they just want a mate, Kizuki’s (Kokushibou) would have any interest in seeking out their mate, unless they meet their mate by chance..