When Ultraman Belial, emperor of the Galactic Empire, has a daughter, he hopes she'll be able to defeat the Land of Light. But his adviser, Dark Gona, suggests sending Her Highness the princess to the Land of Light to learn their skills, using the enemy's strengths to defeat them. Ultraman Belial readily agrees.
Many years later, Belial calls her. "We agreed on three years, then three more years, and now it's been ten! I'm already free, and you still haven't come back!"
"Soon."
"How soon? You said that last time, too!"
"This time, I really mean it." Niijou Akane's tone is calm. "Zoffy is retiring next year and has recommended me for captain."
"...Say that again?"
"The Space Garrison. Captain."
"You're a spy! What do you mean, captain?!" Belial explodes with rage. "I'm about to invade the Land of Light! Which side are you on?!"
"Before you ask which side I'm on, remember to attack from the west. The defensive network I set up there is weak. Don't hurt my troops."
Please enjoy the story of Niijou Akane switching between various Ultraman forms and conquering the Land of Light.
Nexus (completed) - Tiga and Trigger: Ancient Civilization (completed) - Ultraman Galaxy (in progress) - X - Orb - Geed - Z - Ultraman Saga.