Since you seem so worried about you english, I'l try to help you out Even though english is not my native language..
At 1:50 Monk says "learnt" but that's the past participle of learn, it should be the past tense "learned". But that is a very difficult subject, and very hard to notice Most "native english" people would make the same mistake.
At 3:25 Davis says "you always felt me odd". I think that what you were going for is that Monk thinks he is strange. Then it would be "You always felt I was odd" or instead of "felt", use "think".
Davis again at 3:33, should be "I will only COME when I BECOME more powerful".
At 4:13, Liso's line, the word "servent" is misspelled
Him again, 4:27, the phrase is poorly constructed. If it means Davis will gain power that will enable him to defeat anyone, t should be something like "if you obey me, I will make you so powerful, you will defeat anybody."
About the other features of the video: I liked the music, it was well fitting. The animation seems smooth enough, though the floors rendering speed is a little low (lots of light dots that fade away) and the character's movement leave a "trail". The story s interesting enough, though in 5 minutes you could fit in more information. And finally, I felt that Monk should have a real name.
All-in-all, a nice video. You just need to make it more uniform (dialog with char's image, withouth, then with again is really off putting).