This is a fan-fic based on Kagamine Rin and Len's song "Karakuri Burst." Rin plays the role of a crazed murderer, ordered around by the true psychopath Miku. Len is in a secret circle of the Japanese police. This circle gets the classified cases. Len is chosen to lead the circle into the brutal battle between good and evil and races against time to find this secret killer before more innocent lives are taken. In the bloody battle, you will follow both sides of the story, good and evil.

Something between an impatient child and a cold hearted killer, a silent, paranoid, asocial teenager and smooth womanizer, Len is his own worst enemy.

Hello, reader. My name's Rin, and the author would like for you to read on~ why? Well, don't you wanna read a rinxlen fanfic? Yes? No? Maybe? You know you wanna read~ read on as I am 'invisible' to others, and soon someone is intrigued with me. His name is, as I recall, Len. He has showed me many of his feelings, but has not told me why he talks to me. Miku soon realizes this, and tries to intervine. What will happen?

Contains Len x Rin, Kaito x Miku, Gumi x Yuma, Gakupo x Luka. Len's been in class with her for almost a year now. So why does he notice her towards the end of the school year, and is suddenly falling for her? It's an unexplainable pull for him as he's drawn to his classmate, Rin, and as he learns more and more about her, he learns a lot about himself as well...not to mention how his advances towards her are breaking and reforming friendships faster than you can say "World is mine," and best friends begin to drift apart as jealousy and confusion follow.