Ultraman Saiyu Through Ultraman

I, female, named Yu, codename 0, have many identities, so many that I don't even know. For a necklace, I was reborn into the world of Ultraman, and became the younger brother of Ultraman Zero. Yes, younger brother. There is also a two-part system, cheating money every day, my job Karma is a killer, the uncrowned king of the dark world. Perhaps, because of this, I was sent by the headquarters to get the Yalansi Divine Chain. Who knows, it was a trap, but I made money. They wanted to use me to get the Divine Chain and kill me to reap the benefits. Do you think it is possible? The legend begins... This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.