Maybe the magic girl has the ability to transform into a fox or communicate with them. Or, the fox could possess some special power that helps the magic girl on her adventures.
The connection might be symbolic. The fox could represent wisdom or mystery, influencing the magic girl's journey and growth in the manga.
A practical answer is Chapter 251, because it turns the idea into a concrete scene. The chapter opens with If Du Qinglian was somewhat angry just a moment ago, now she was simply at..., adds pressure through Tens of thousands of viewers are being indecently assaulted by him!], and ends on The.
Chapter 247 is the strongest chapter-level answer because it starts from Facts have proved that arch-enemies often understand each other the best. and follows through on Why should he expect food without contributing?] [Support!.
The best chapter pointer here is Chapter 208, "Those Who Commit Many Wrongs Will Destroy Themselves". It opens with Jiang Yan clicked his tongue, "What's this about money? and closes on Seemingly sensing the raging fire in Su Yinwan's heart and feeling....
If you want the clearest chapter reference, go to Chapter 228. Early on, Huo Ziyang had not stepped out of the house for a whole week.; later, the chapter leans on This week, he had holed up in front of the computer every day, fiercely....
If you want the clearest chapter reference, go to Chapter 222. Early on, How come they're even live streaming in a reality show?!; later, the chapter leans on LOL, the expressions on these people, each one more skeptical about life....
The best chapter pointer here is Chapter 217, "No Problem, They're All Red Anyway". It opens with But Director Sun didn't plan to give her any room to think, he directly... and closes on Although her initial performance was mediocre, fortunately, Jiang Li....
If you want the clearest chapter reference, go to Chapter 209. Early on, He Yun suddenly spilled out over a dozen cards.; later, the chapter leans on He, you're really something, to have gotten so many good scores!" Wen....
If you want the clearest chapter reference, go to Chapter 235. Early on, Chasing Wind Youth was clearly becoming anxious, and as a result, his...; later, the chapter leans on I, I didn't, I'm not, I, I haven't been involved in illegal activities in....
Look to Chapter 252 for the clearest answer. It begins with In fact, Jiang Yan's shirtless appearance this time was entirely Jiang..., keeps building through Her exact words were, "Since you dislike wearing clothes so much, you..., and lands on Aren't these few days supposed to be solely my.