Princess Ial, also known as Mio, is the overarching protagonist in Hikari Sentai Maskman. She is the princess of Underground Empire Tube.
She is portrayed by Mina Asami, who also played her villainous sister, Prince Igam.
Ial and Igam are sisters of the Igam family, they often earn glory for the royal kingdom. Unlike her sister, she is a smart and gentle girl, the two fate was very different. At first, Emperor Zeba overthrow their parents, Igam joined the evil side and helped Zeba to reinvigorate the industry, Ial learned that the Underground Empire was come to invade the earth, she is quite going to the world and support Takeru. The only one can betrayed her sister, Ial has long lost her memory and regrets.
When Ial arrived at the earth and turned into a civilian called Mio, as well as the one who usually compared to be love with Takeru. Later on, Ial could not escape and abused by Igua Doggler. Ial was punished by Zeba, Igam used these unscrupulous means to killing her. Ironically, she was imprisoned into the Eternal Freeze, although the fierce battle between Igam and Takeru was pretty good after all. However, Ial was later saved by Takeru and it was necessary to prevent Igam from making offense.
Until then, Kiros using his own plan to captured Ial and getting killed by Takeru, Igam and her guardian, Fumin, whom are so be clearly that they was very annoying, managing to attacking Takeru, who releasing Ial and by turned out that he reunited with her, upon they hurry up to leaving. While Igam pursue Ial and Takeru, with all the forces of the Tube, she trying to killing them again, much to her anger, even when she is gets stopped by the Maskmen. However, she fights with Takeru once more, which Maskmen also fights with the Tube forces.
As the result, Igam had been enough to attacked Maskmen, she called her guardian, the Igam Dragon to blasted them. Eventually, Ial and Maskmen arrived in the Underground Castle, they then received a ball, because of they are about Zeba's really identity, which he is actually his true form, Lethal Doggler II, an child of the late monster, the original Lethal Doggler. Igam believing was bad luck as she refused thinks about this, she went to against Takeru and seeing the Underground Castle was likely earthquake, causing her knocking into faint.
Upon Ial preparing to gets out of the castle with Maskmen, Igam later saved by Takeru, without makes her to be demise, and Ial then using her hand to holding her sister. As Igam ignores her under the pains, she was bringing out by the Maskmen, which leaving them alone. By the way, Zeba initiate the evil particles on the ambience, having times to both improving the Underground Castle and whole control the earth in the eternal darkness. Before Underground Castle is topple, Ial eventually persuade her sister, making her to abandoned her evil ways.
The castle begins to falling out, She sees her sister and Fumin were strained by the rock. Fumin, who sacrificed herself to defended Igam, ended her life into died after she saying the last words to her. Igam keep grief out to mourned her, Takeru saving her again, and Ial, who escaped from the castle, as she left together with Maskmen and her sister, due to Zeba carrying commit a coup to be with the horror. During the final battle, Ial worried about that Igam decided to redeemed herself and helps Maskmen to defeated Zeba, even if she was not really exaggerated.
After Zeba dies, Igam eventually to become a nun and embarked on a road, Ial promised as the new empress and rebuild the kingdom. She meet with Takeru for a last time, but they were temporarily separated.
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