I Transmigrated into Gaia: From the Start, I Signed In for Reiblood's Bloodline

[Ultraman fan fiction + transforming into an Ultraman + summoning monsters] My name is Nangong Yunxi. I was an orphan with no parents. One day, after work, he turned on the TV as usual, and it happened to be showing episode 25 of Ultraman Gaia, where the two Ultramen’s conflicting ideals reached their peak. Just as they unleashed their finishing moves against each other, he was sucked into the TV. Fortunately, after transmigrating, he was still Chinese. He now had parents as well as two younger sisters he had adopted. It was the first time he had felt the warmth of a family, and he vowed to protect his sisters. His parents had worked as assistants for Alchemy Heart, an organization of super-geniuses, but died in an accident. Nangong Yunxi was only eighteen that year. After receiving a huge compensation payout, he gave up on college and devoted himself entirely to looking after his sisters. He thought he would never have anything to do with the plot in this lifetime, but then his younger sister received an invitation from Alchemy Heart because of her exceptional abilities. Worried something might happen to her if she went alone, he took his younger sister and settled in Tokyo. The moment the prophecy began and the Root Core Destruction Body descended, he awakened the System. The beginner’s gift pack gave him Golza and the Ultimate Battle Nizer, while the sign-in reward granted him the bloodline of the Reiblood Alien, giving him the power to command monsters. On top of that, he was recognized by the Light of the Sky and became the third Ultraman in this universe. He trained monsters while protecting the peace of Earth. “Dragons are symbols of emperors. Ryugon, will you become my Pokemon?” “You want to challenge me? First beat the Hyper Zetton I’ve got right here!” “You’re an alien? Too bad I’ve got cosmic white blood cells that are made to kill aliens!”