She's the most serious-minded of the eight Valhallan princesses and stickler for the rules. She made a brief appearance in the first series, and plays a role in the third. She is considered the adjudicator of the Royal Family and has a special attack called the Thrust of Death, which sends anyone to the Punishment Dimension. Everyone fears her, even the violent Hydra. Inarba enforces the Law of Valhalla, and any offenders she meets will suffer the Punishment Dimension, which causes them to live out their greatest fears or some ironic punishment. Laine wasn't affected by it because she didn't pay any attention to what was going on when she was sent there. She comes to Earth to judge the members of the Royal Family and to make preparations for Kazuto and Valkyrie's wedding during the Stellar Season. So far, only Kazuto's sister was able to counter Inarba's Thrust of Death, in which the impressed Inarba declares Rika to be her eventual successor, though Rika sees the training as just more homework.

UFO Princess Warukyure, aka UFO Princess Walkyrie is about a princess from outer space who accidentally crashes on earth, where Kazuto desperately tries to maintain the public bath of his grandfather. Due to circumstances, Kazuto receives part of princess Walkyrie's soul which forces her to stay there with him. But that's not the only problem ... because her soul lost strength, the princess transforms both mentally and physically into a little kid!<br><br>
(Source: AniDB)

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Mother of voice actress [Honoka Inoue](https://anilist.co/staff/129363/Honoka-Inoue). She has held a long-running gag of being 'eternally 17 years old'.

The third season doesn`t have a particular story behind everything (like "Valkyrie Ghost" in the second season). It just tells 6 stories about the life of Kazuto &amp; Co. with some additions: Raine and Chorus get a house on earth, the last three Valhalla princesses each get an episode, and in the last episode Kazuto and Valkyrie, who in the same episode managed to stay adult, &gt;try&lt; to marry again. <br><br>
(Source: Anime News Network)