She is the younger sister of Keigo, who admires Daisuke as "big brother". She is soft-hearted in nature and is welling to help the others. Since she is born blind, she is usually assisted by her friends including Akatsuki, Iroi and Atsu. Being a Mishitsuki. She is not aware of the existence of her bug because her bug lives by consuming dreams from the others (usually Keigo's). Her bug is a garden tiger moth that can sense existence and movements of the livings through temperature change, and ignite flame to attack targets. She is the main heroine for Vol.2 of the novel, and reappears many times in later episodes. Her powers usually come to help in vital situation. Her bug was given by "Shinbu", one of the Original Three. The whole story for volume 2 revolves around Shinbu targeting Senri to make her bug "more complete". On the train to bring her to the isolation facility, Daisuke is sent to protect her and would face the remaining members of Mushibane who swore to destroy SPEB; Akatsuki and his company, who swore to protect her too; and Youichi, who is sent to assassinate her. She rejects Shinbu's lure and turned her bug against Shinbu. With Daisuke's help, they were able to defeat a portion of Shinbu's real body. Senri now joins the East Central branch of SPEB and her bugs no longer consumes dreams from the other.