So here are some references used in the first chapter:
1. Erza is a character from Fairy Tail who can requip her weapons, or in other words, it just means that she has to go though a lot of costume changes in the manga.
2. Roronoa Zoro is a character from One Piece. He is a skilled swordsman who is famed for the use of his “Santoryuu” (Three-Sword Technique).
3. Edward Elric, the protagonist of the manga Fullmetal Alchemist, is able to perform alchemy using a transmutation circle. You can read more about the series here. (I trust the wiki pages okay)
4. Mentioned briefly is the character Sawada Tsunayoshi from Katekyo Hitman Reborn!. The X-Burner is Tsuna’s powerful attack fired from his weapon, the X-Gloves.
Yup, that should be just about it! If there’s any part of the story that was confusing, please do leave a comment below and I’ll reply asap! 😀