A twenty-year-old ordinary college student, Guang Guang, was brought into the world of Ultraman Trigga by a mysterious light after chasing the last episode of Ultraman in a rental house. He obtained a system called the "Cosmic Picture Book" that can retrieve information on all monsters that have appeared in the Ultraman world view - from Bermura of the first generation of Ultraman to Orga of Destruction of Triga, all the information of 1,472 monsters has been engraved in his mind.
More importantly, he inherited Ultraman Leo's light.
Leo, the prince from the L77 Nebula in Leo, his hometown was destroyed by the Magma planet. After living on the earth, he grew up to be the king of fighting under the harsh training of Ultraman Seven. He is the most special of all Ultraman - he is not a top student from the Kingdom of Light, he does not have fancy light skills, and his energy can only last two minutes and forty seconds. But he has an iron rule: never lose to fate.
Ricoh took Leo's light and met Kengo Manaka, the human form of Ultraman Triga.
