Spectrum of Yellows: Vocaloid Fanfiction (Pairings in desc.)

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...