His real name is Asahi Sakayori. He is Iroha's older brother who moved to Tokyo earlier than her because he was fed up with their mother. However, seeing him complain to Iroha about needing to contact their mother suggests they have a decent relationship. As a member of Black Onyx, he wins the 'KASSEN' game against the Kaguya-Iroha-Yachiyo alliance, but uses the excuse of his comeback loss to Kaguya in the Yachiyo Cup to call off his marriage to Kaguya and instead becomes Iroha's moving guarantor. Normally, a top-tier Liver unit wouldn't need to challenge a rising Liver, but he realized the identity of IroP working with Kaguya and used the marriage proposal as a pretext for a game match to set the stage for the Yachiyo Cup turnaround. It seems he felt responsible for leaving Iroha behind when he went independent. During Kaguya's graduation live, he even used unauthorized programs to stop the Messengers of the Moon. In the final stages, he supports Iroha's artificial body research with the money he earned from Liver activities, acting as a reliable ally to Iroha until the end, contrary to viewer expectations. There is a significant gap between his real-world appearance and his Tsukuyomi avatar. Unlike his boisterous, muscular, and cheerful avatar in Tsukuyomi, his actual appearance is that of a calm, handsome man. The bespectacled man seen eating potato chips while watching Kaguya's activities mid-story is implied to be him. His appearance ten years later, shown in the epilogue, closely resembles his late father. In the novel version, it is revealed at the end that he is living with Noi. It's not just a simple living arrangement; their relationship is close enough that his grandfather worries about him not producing an heir. Noi is the younger one, and Mikado is the older one.

Basically realistic and calm, with a sophisticated image, but she is emotionally sensitive, such as shedding tears while looking up at the night sky while listening to Yachiyo's songs. She also loses her composure regarding Yachiyo, such as watching Yachiyo's performances while crying and sniveling. She has musical experience and can compose, but quit for a certain reason. Through this ability, she helps Kaguya's Liver activities as her producer. She is Mikado's younger sister.

Free-spirited. Came from the moon. Loves Iroha. Living with Iroha. Very mischievous.

Taciturn and shows no emotion. Noi's older brother. One of the members of Black Onyx.