Not bad
The animation and design is great, along with the music. I personally think the voice acting could use some work, more so from a volume perspective, a lot of the voices sounded like someone talking into a mic, it had that scratchy easy to identify mic sound to it, and it kind of breaks the tone of the movie. That being said, I think that the voices overall were well done, but the dialogue could use a bit of work.
As far as story and characters go, I may be biased because my cousin happens to be like the characters in the animation. The whole nickname and weird Japanese tone always bugged me (We're both half, but she tries way too hard). Because of this, it's kind of weird to see someones personality reflected in an animation, so as far as relateable, likable characters go, I'm pretty detached on this one. I also don't entirely understand the jock stereotype either, I got along fine with everyone in school.
Now that being said, I think the characters have some potential, but they weren't exactly introduced all that well, I'm not entirely sure who is who. One guy seems dirty, the other draws, one wanks off, one is into martial arts, it's all kind of thrown at you at once, but it is the first episode, so I assume they'll be better established in the future. I'm assuming it was like this because you're all friends, so you already know what the group is like, but we don't.
Now I see a lot of reviews about how funny it is, but I would say it is humorous, not hilarious. To elaborate, humorous I see as more like something that makes you smile, hilarious is something that makes you actually laugh. It's tough to do in a flash animation, but I think there's some potential there.
Overall, you've got some great animation skills, a great choice of music, and a lot of potential for characters and voice acting. However, the personality of the characters doesn't fit all that well with me. It was still a great first attempt, congrats on front page, and good luck on your future episodes.