A New Generation Villain's Journey!

[Female lead, no romance, family bonds, friendship, lots of side pairings. Don't read if that's not your thing. The author's writing isn't great, and I'm not very good at handling personalities.] Hi, everyone. My name is Wen Xingrao, and this is my second transmigration. Yes, you heard that right: the second time. This time, the world is quite peaceful and ordinary, almost exactly like my old one, except it doesn't have the Ultraman tokusatsu series. But I never expected that on my birthday, after living with my brother for eighteen years, an actual Ultraman would drop into our house. He even said my brother had light within him. Okay, got it. I guess I've become the little sister of the protagonist of some Ultraman fan-fiction universe. I never expected my brother's story to follow the same script as those of the troublesome New Generation heroes. So here's my question: if sacrificing a family member makes you all-powerful, am I going to die or not? Oh my god! I really regret not teaching my brother martial arts! If I'd known, I would've made him train with me when I came clean eight years ago. Still, luckily, I was clever enough to record it in advance. Now some Ultraman has an embarrassing moment on video for no reason. I forgot to introduce him. My brother's name is Wen Fuyao. But it looks like my brother is about to get a nonhuman boyfriend, and that is not okay! My brother found me a new older brother to call my brother. I hate that I came to my senses so late. I should absolutely be getting in their way, but instead I'm still helping them along.