Saibai Yuuki is the father of Rito Yuuki and Mikan Yuuki, and the husband of Ringo Yuuki. He works as a mangaka and is very different compared to Rito in terms of both looks and personality. He lives in his own apartment where he does his work as a mangaka, due to living really close he appears slightly more often in the series than his wife does. Saibai is known to possess great skills as a manga artist, one of his most notable skill is that he can draw at an amazing speed.