Mirai has bright green eyes and hair. She keeps her tresses in a half ponytail and has bandages covering her left eye. She wears a beige sleeveless top and matching trousers with a green sash around her waist. Mirai accessorizes with golden bangles and armlets.
Mirai has an insouciant, vivacious and ebullient trait. She also has a crush on Juraki, just like her sister Urne. She is reckless when fighting after she lost her sister and underestimates her opponents even with clear evidence of their fighting prowess surpassing her own. She, like her sister, believes that it was her calling as a warrior to accept enhancement, knowing well that weaker werewolves were sacrificed for the technology. Mirai is driven by emotions: she charges at the RK members to avenge her sister's death. She loses her temper when she sees that many nobles have entered their territory and refuses Juraki's suggestion that they withdraw.
Mirai and Urne frustrate M-21's attempt to flee during his battle with Gayare. Gayare overwhelms M-21 shortly thereafter. On Juraki's instructions, the twins create a barrier
allowing Gayare to deliver a finishing strike without causing further damage to the city and its inhabitants. They are surprised to see that M-21 has survived the attack. For a moment, Mirai wonders if M-21 is indeed not one of them while Urne states that he could be of use to their clan. They are present alongside other warriors when Kentas is declared a traitor by Maduke. Later, Mirai and Urne greet Lunark and express their disbelief about Kentas' alleged betrayal. Lunark is reminded that she is the only warrior who is yet to embrace the new power. Mirai warns her that the others have grown suspicious since she was close to Kentas and tells her not to lose their Lord's favour.
A few days later, the warriors assemble again in the throne room. Dorant informs their Lord that Lunark has disappeared just as he had expected and offers to bring her back. The twins are exasperated at Lunark's folly to ignore their warning. Maduke fortells Lunark will return with Muzaka and orders the warriors to lay wait for the traitors.
In an unexpected turn of events, Raskreia wages an attack on the werewolves to avenge Rajak's death. She is accompanied by Kei and Rozaria; the latter destroys Maduke's Castle, drawing the ire of the werewolf Lord. Urne and Mirai rush to their Lord's side and witness Divine Judgement a second time. Maduke sends them to capture the culprits. They encounter Lunark and M-21 and accuse Lunark for not only betraying their race and bringing Muzaka, but also of destroying the Lord's castle. Lunark clarifies that she was not the one to destroy the castle but adds that she never expected it crumble and always found it rather flashy for werewolves. Incensed, they warn her to turn herself in and accept her punishment as a warrior. Lunark reminds them that they sacrificed the ones they were sworn to protect for power. The twins are outraged by the insinuation, however, Lunark agrees to accompany them in order to afford Muzaka the time to rescue Kentas and Garda. Lunark asks them to let go of M-21 since he would be of no use- something Urne complies to by shooting an energy beam. To their surprise, Lunark blocks the attack and challenges them to a battle. The fight is an uphill challenge for her due to the extraordinary regeneration ability of her opponents. M-21 enters the fray and takes on Urne. This allows Lunark to focus her attention on Mirai. Just as Lunark is about to deliver a fatal attack, Juraki arrives and defends Mirai. He tells her to step back since she is not a match for Lunark. Meanwhile, members of the RK arrive and prevent Urne from killing M-21. They overwhelm her and M-21 kills her by unleashing the phantom wolf attack. Mirai swears to avenge her sister and charges at them. Seira undertakes to fight Mirai and defeats her. Once again, Juraki intervenes and saves her. Lunark reminds him that he has to face her first.
In addition to basic werewolf abilities, Mirai and her twin sister have demonstrated proficiency in creating barriers. During the fight between M-21 and Gayare, they create a barrier to contain a powerful discharge of energy by Gayare.