Dragon Clan: Dragon Power Was Stolen at the Beginning

A system bound by others' time travel: you will receive a dragon-slaying sword upon signing in, and you will be a max-level boss at the beginning. The system I am bound to: The novice task is to say "please stand in line, thank you" to people who cut in line in the cafeteria. The reward is "weak dragon's breath" and the white mist that breathes a few tenths more seconds than others in winter. The heroines around others: the cold goddess, the domineering president, the mysterious witch. The heroine next to me: a carp spirit holding strawberry milk, wearing a small fish skirt, talking without any clue, but can crush steel with one hand. She said that I was a dragon, that my dragon power had been stolen, and that she would help me get it back. I looked at my thin arms and then at her serious eyes. Okay, I believe you once. After all, the strawberry milk she gave me was quite delicious.