Ruka Shinoda

"Border's gotten as big as it has because of our existence and Karasawa's hard work."

- Ruka Shinoda to Osamu Mikumo and Yūma Kuga

Ruka Shinoda is the princess of the fallen state Aristera, operator of Border's Mother Trigger, and the older sister of Yōtarō Rindō. She is not related to Masafumi Shinoda by blood; rather, she was given his surname in order to pretend that she is related to him so that Border is able to shelter her.

Appearance
Ruka has dark, medium-length hair that curves to the front, in addition to bangs.

Personality
Ruka is quite arrogant and has no problem informing people that Border's success is in large part due to herself. However, Director Rindō emphasizes that she is nicer than at first glance. She is also very protective of Yōtarō Rindō.

Yotaro Rindo
Yōtarō and Ruka are siblings. They usually see each other once a week. They have a good relationship, and Director Rindō says Ruka is protective of Yōtarō.

Masafumi Shinoda
Border shelters Ruka by pretending she is a relative of Shinoda's. They're relationship is strained at the moment. Shinoda describes Ruka as "A handful" while Ruka describes Shinoda as "Unruly."

Kyōko Sawamura
Sawamura is Ruka's aide and they seem friendly. Before Kyouko and Shinoda leave Tamakoma, Ruka asks Sawamura to look after Shinoda.

Michael Cronin
Cronin has been with Ruka and Yōtarō Rindō since they lived on Aristera. He and Ruka seem friendly.