"You once taught me Mirai. Ultraman fights for humans because they love them. That's why you can't die. It make no sense to die because of kindness."
- ―Aya's words to motivate Mirai as he fights against Yapool
|Home world:||Planet Earth (Nebula M78 Timeline)|
|First appearance:||Ultraman Mebius & The Ultra Brothers|
|Last appearance:||Ace's Wish|
|Number of appearances||3|
|Family||Supreme Chancellor Takenaka (grandfather),|
Takato Jinguji (brother)
|Portrayed by||Aiko Ito|
After Ultraman Mebius successfully defeated Alien Temperor, Alien Zarab infiltrated Aya's lab and captured her. Alien Zarab took the form of Aya, and gave a glass of coffee to Mirai, and he accepted it. Mirai didn't know that the coffee is poisonous. After he drank it, he felt his body paralyzed and Aya herself became Alien Zarab. With Mirai still paralyzed, Alien Zarab attacked the city in the form of Mebius. Later, with such a big effort, Mirai finally could transformed and defeated Alien Zarab. But after that, a long battle came to Mebius and Ultra Brothers came to help him. After Alien GUTS finished, U-Killersaurus was finally resurrected. But Yapool betrayed Alien Nackle and destroyed him. The Ultra Brothers fought with U-Killersaurus, but nothing could destroyed it. When Mebius was about to destroy U-Killersaurus' head, he saw Aya trapped in a crystal in the forehead of U-Killersaurus. When Mebius was about to be killed by U-Killersaurus, the Ultra brothers gave their remaining energy to changed Mebius became Mebius Infinity. Mebius overpowered the super beast, destroyed U-Killersaurus and saved Aya.
In episode 43, she visited Phoenix Nest to see his grandfather and invited Mirai to spent a day with her. When Mirai and Aya walked in a park, they were followed by a Hyena-reporter, Hirukawa. Suddenly, a mysterious black costume man with balloons approached Mirai. He told him that he was Yapool. He released a gold strip-red balloon to sky. The sky cracked and a portal opened for Mebius Killer to jumped to earth. Mirai told Aya to take cover. But he didn't know that he was being followed by Aya and she saw Mirai transform into Mebius. When Mebius was about to lose against Mebius Killer and was exhausted, Aya cheered him up that "It make no sense if you die because of kindness, please stand up." Mebius stood up again and fought once again and destroyed Mebius Killer with Mebium Dynamite. After the battle was finished, the floor below Mirai, Aya, and Hirukawa stood in was cracked and sent them to Yapool's dimension. They saw the city was destroyed. Hirukawa attacked and hurt an exhausted Mirai for GUYS didn't exist while the Earth was attacked. Suddenly, the black costume man, Yapool, appeared again. He ordered Hirukawa if he want to save Aya, he must shoot Mirai with the gun that Yapool gave him. Hirukawa, with no other choice, shoots Mirai and Aya. But Mebius uses the Mebium defense arc to protect him and Aya. Yapool attacked Hirukawa for the failure.
Yapool tried to persuade Mirai why he must protect bad men like Hirukawa and asked Mirai to join Yapool, but Mirai refused. When Yapool had the answer, he transformed into his true form and Mirai transformed to fight him, but Yapool overpowered Mebius. Aya once again tried to cheer him up him, but it was useless and Mebius's eye was about to close. But, Ultraman Ace told to him via telepathy that Mirai's friends would always be connected to his heart. Once again, Mirai stood up again and changed into Burning Brave Mode. This time, Mebius overpowered him and destroyed Yapool. In the end, Mirai, Aya, and Hirukawa came back to Earth. When Mirai and Aya rest in park while waiting for Phoenix Nest to return from the moon, Aya thanked Mirai and kissed his cheek, which made Mirai felt shy and confused.