Becoming a "Celestial Maiden" was an exceptionally simple process for her. She merely had to find the Celestial Maiden who had saved her before, express her gratitude and longing, and she was given a chance to test her talent. After testing, it was confirmed that she indeed possessed the innate gift to become a Celestial Maiden.
Since then, she rarely used the name "Lu Hongdou" anymore, but rather adopted the code name of her Celestial Maiden identity—Canna.
Or it could be said that "Celestial Maidens" weren't really called Celestial Maidens. The true, self-acknowledged name for this group of girls should actually be "Magical Girls."
Martial artist Lu Hongdou became Magical Girl Canna.
Of course, becoming a Magical Girl didn't mean she had abandoned martial arts. Quite the contrary, it was precisely because she had become a Magical Girl that she grew even more fanatically devoted to martial arts.
While other Magical Girls were researching the powers of their Magic Armor, she was researching how to integrate Magic Armor with her own martial techniques.
While other Magical Girls were studying the uses of Magic Techniques, she was investigating how to use Magic Power to unblock her own meridians to artificially create "Qi."
When other Magical Girls reached the pinnacle of their ability to bloom, studying how to maximize their combat strength with "Great Prosperity Bloom," Canna was delving into the essence of "momentum."
This kind of research couldn't be separated from the power of a Magical Girl, nor from the support of Magic Power, which is why Canna ultimately even gave up the chance to continue living in the Material Realm and entered the Magic Kingdom, completely becoming a citizen there.
As a result, she became reclusive, shunning social interactions; she became unkempt, not allowing room in her heart for anything else; she became obsessive, with "becoming stronger" being enough to replace everything else.
In such incessant questing, eventually, Canna succeeded.
She not only successfully reproduced the theoretical concepts of "Qi" and "momentum," but even combined these two with Magic Power, creating her own school of thought and becoming a top combatant.
But at the same time, Canna also failed.
Because she realized that her "Qi" and "momentum" were not so much about martial arts as they were applications of martial arts concepts to Magic Power, highly dependent on the strength of a Magical Girl. Once she lost her Magic Power, she would also lose her "Qi" and "momentum."
This was unacceptable to her.
The path she sought after in martial arts had to be pure, achievable through martial practice alone. If she had to rely on Magic Power to complete her martial path, then it wasn't truly martial arts, but merely a branch of a Magical Girl's power.
It was under these circumstances that one day, Canna's superior, the Magical Girl codenamed Purple Diamond who was in charge of the treasury, found her.
"Dear Canna, my most capable assistant, I have a way to help you master the Magic Power of the Remnant Beasts, which might aid your research," she said straightforwardly, presenting her own terms to Canna.
"...Boss, let's talk straight. What do you want me to do?" Canna asked.
By this time, years of research and practice had already faded Canna's childhood hatred for the Remnant Beasts. Rather, compared to her current obsession with martial arts, such hatred was hardly worth mentioning.
"I plan to leave the kingdom and establish my own organization."
With a smile, as if confiding in a close friend, Purple Diamond softly said, "To help those Magical Girls and Fairies who are not accepted by the kingdom, to establish a sanctuary outside the kingdom that belongs to us."
"You'll help me, won't you?"