Thank you for this story and the time and effort that you have put in to it.Please ignore any and all flames.Enjoy your self when you write and have fun in your life when you can.
I have a couple of constructive comments for you. First off, there were a couple of momets where your writing became slightly repetitive. Example: Ken says I'd have to agree. Then a couple of lines later Albus says the exact same phrase. I know it's a bit nit-picky but thigs like that jump out at me for some reason.
I also have an overall comment for you on the character of Ken. I think he has a lot of potential and I like reading cocky wizards. I just wanted to caution you about making a character too *unusual*. A former transfer student, Japanese, super-wizard can feel like an unreal character. Too many unusual characteristics coming together just make a character feel off unbalanced.
Overall: I think this fic has loads of potential and best of luck with it. Happy writing.