Don't like it

First fanfic that made me hate Len XD lol.
Nice story !
LOVE IT :*

-Shino No Mikaga No Kudotaka

I definitely didn't expect this to happen after reading chapter one. I was expecting doom and gloom. However, the ending was a pleasant surprise.

There's one thing I want to point out: You use a repetitive sentence structure.
For instance, "And with a surging sense of hope, Miku hardened her grip and violently yanked down with the force of a woman extremely pissed off. Face twisting in pain, Len Kagamine screamed out bloody murder. Arching back in pain, the world spun as he was suddenly yanked back by his hair."
You use the "somethingsomething, somethingsomethingsomething." type of structure a lot. This isn't a bad thing, but it never hurts to mix up your sentence structures a bit.

Overall, this was a quick, nice fanfic to read. I enjoyed it.

Oh wow. Len...why the hell are you such a bitch to Rei...and Miku. .3. Now I think somewhat differently of Len.
Good joob on this story, Author-San. Another good one!

I'll be honest, I was expecting some vague Miyazaki story because the prologue seemed liked Rei would end up in tears, but I was pleasantly surprised to see Miku kicking Len's ass. I always love some good drama in fics.

... Rei is really cute. Ah, and why is Len such an asshole? Jeez, poor Rei.
Regarding Miku, she had this cool type of character that I am very found of. I would say I'm bias though, because Miku is one of my favorite Vocaloids, aha!

I would also like to point out a few things, so please excuse me if I sound rude!

- Sp maybe, just this once, she'd make an exception.
I think you spelled 'so' wrong. You probably just overlooked this, but it's alright because it's just a minor error.

- Standing on a chair, Rei Kagamine looked down at his brother, and heroically yelled out "Die foul beast!"
You actually don't need that second comma, but you need a comma between 'out' and 'die'! You would only need that second comma if the sentence had the subject 'he', because then this sentence could be split into two different sentences like this:
- Standing on a chair, Rei Kagamine looked down at his brother. He heroically yelled out, "Die foul beast!"
Coordinating conjunctions and commas are really confusing, so it's understandable that people make this mistake!

- Blushing bright red, the boy could barely spit out a response. "B-But I barely did anything. I...I'm sorry."
I think 'B-But' should be 'B-but', but I'm only 80 percent sure on this.

I'll keep my eye on you for future works! Keep up the good work!

This is very interesting I like your monologue! :D

This seems really cool, and it's awesome that Rei is the reason for whatever "it" is.
Update soon! X3