Missing Xenon mastery book from quest?

[Kagamine]

So when you hit level 70, you get a special mastery book for fourth job. I'm 100% positive I accepted it and got the book, but looking in my inventory now, it's nowhere to be found.

Unless I'm completely blind or my eyes are consistently skipping over it..

[High]

Weird, it worked for me.

[Niernen]

Cant say, maybe you accidentally tossed it? Are you sure you got one in the first place? Mine worked fine...

[Kagamine]

Turns out I was an intelligent human being and dropped it without realizing it >>; Gonna close this.