Takumu Mayuzumi

Mayuzumi Takumu (黛 拓武, Mayuzumi Takumu), also known as the Burst Linker Cyan Pile (シアン・パイル, Shian Pairu), is Haruyuki's and Chiyuri's childhood friend. In an attempt to win Chiyu's affection, he regularly abused the Brain Burst program to get perfect grades. However, after being defeated by Haru, he realized the error of his ways and joined Nega Nebulus.