Kalista, who has been practicing on the fairy mountains in China and is proficient in Chinese magic, is suddenly driven back to her hometown in England to attend Hogwarts School of Witchcraft and Wizardry by her master.
"I'm not a foreigner! I'm obviously Chinese!"
After studying Western magic extensively, she discovered
"It's still convenient to use magic!"
So...
"This wizard! Sword flying is prohibited in Hogwarts!"
Purpose: You are an indispensable part of the puzzle of my life