Imperial Premier of Yamatai, sister of Ketsurui Yui, and former Empress of Yamatai Star Empire, Yuumi is one of the oldest Nekovalkyrja.
Yuumi was raised by Ketsurui Uesu to be Empress, and he abdicated the throne to her. She was killed in an Elysian attack that destroyed the old capital of Yamatai, Geshrinopolis. Eve recreated Yuumi using a secret mental backup and held her hostage for several years, using her access to manipulate the PANTHEON system. Luckily for Yuumi, she was recently rescued by the crew of the YSS Sakura. After recovering from her severe mental duress at the Empress' Palace in Kyoto, she became politically involved again in YE 33, when she agreed, for the good of the Empire, to serve Empress Himiko as the Imperial Premier.
Yuumi has teal hair and red eyes.