The subtitles are very bad, deliberately. (I didn't use Google translate, though. lol) I'm putting a transcript here so Harry knows they don't say anything crazy.
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このビデオでひどい字幕があるよ。私は面白いだと思いますから。wwwwww
This video has terrible subtitles. Because I think it's funny. lololololol
お前にいいことを見せるよ。
I'm going to show you something nice.
今の俺は普通のおれだぞ。
This is the normal me.
これがスーパーハリーだぞ。
THIS is Super Harry.
つまらない、ウィーアブー野郎!
That's boring, you weeaboo jackass!
そしてこれは…
And THIS...
もっともっとかっこいいボイになるのだ。
Is becoming an even cooler boy.
又は「スーパークールボイ」と言いてもいいだよ。
Or you can just call it "Super Cool Boy".