Why Are My Imaginary Friends Real?!

(Male protagonist) Nora Davenport's imaginary friend has come to life, stepping out of the anime she loves most. This is not something to celebrate, because no one else, living or dead, can see or notice her imaginary friend. Everyone, human or supernatural, thinks she's gone crazy, and even she believes it herself. That is, until she sees a white-haired boy kick an extremely dangerous supernatural creature flying. (Mild horror. The author has several million-character flops under their belt. Every word is typed by hand using traditional methods. The blurb falls short; see the main text for details.)