Nexus, Do I Have to Fight Sukuna Too?

I transmigrated. From the start, my parents were both dead, and I was left to work hard all alone, with only a younger sister who wasn't related to me by blood to depend on. Surely this was supposed to be the setup for some kind of high school romance game, right? What do you mean, I'm fighting Sukuna? What do you mean, an alien beast has appeared? What do you mean, there's a giant conch shell belching black smoke? Wait... what's this glowing thing in my hand? I don't want to be a host! ...When Sukuna was resurrected, he stared in shock at the giant towering tens of meters in front of him. "I'm supposed to fight that thing? Are you serious?"