Kuroyukihime offenbart Haruyuki ihre eigene Geschichte und Rolle im Brain Burst Game. Die Unterstützung, die sie sich von ihm erhofft, bringt Haru in einen großen Konflikt zu seiner langjährigen Freundin Chiyuri.
Kuroyukihime tells Chiyuri that she is dating Haru and drags him to a cafe. While there, Kuroyukihime explains her dilemma to Haru. Brain Burst was anonymously created seven years ago which allows acceleration only to those who were born with the Neurolinker. Therefore, all Burst Linkers are children age 15 and younger, allowing its existence to be concealed from the public. Kuroyukihime wants to meet the creator to learn the purpose of the program. To do that, she needs to reach level 10, which requires five wins over level 9 Burst Linkers and one defeat results in the permanent uninstallation of Brain Burst. Two years ago, Kuroyukihime was one of the Kings of Pure Color, a group of level 9 Burst Linkers that agreed to not fight each other, but she did not agree to the treaty and beheaded the Red King, causing her to be branded a traitor and leading her to seal away Black Lotus. Since then, she has stayed offline, only logging on to the school's local net with a dummy avatar. Recently, she was challenged to a duel by a Burst Linker named Cyan Pile, which could lead to her identity as Black Lotus being exposed. Thus, she must find Cyan Pile's identity. She suspects Chiyuri, which is why she provoked her, although Haru doubts it knowing that Chiyuri is bad at games. Haru begins the investigation by going to Chiyuri's home under the pretense of apologizing for lunch the other day. The two link up with each other with an extremely short cable and reconcile with each other, with Chiyuri letting Haru know that Takumu was not told about the bullying. During the conversation, Haru discovers that while Chiyuri is not Cyan Pile, there is a back door connection that could lead to finding its identity.
Haru viene a sapere di come si sia sviluppato il mondo dei Burst Linker e di come si sia diviso in regni. Scopre anche che il suo sire è uno dei Sei Re del Colore Puro, Black Lotus, il quale in passato aveva tentato di infrangere la pace e di arrivare al livello 10, requisito necessario per avere un incontro con il creatore della realtà accelerata. Per questo motivo Haru, anche se sa di essere ancora alle prime armi, desidera salire di livello velocemente per poter aiutare Kuroyukihime a realizzare il suo desiderio e si unisce alla sua fazione, i Nega Nebulus. Le difficoltà sono tante e non tardano a mostrarsi. Il suo primo compito è identificare Cyan Pile, l’avversario che sta sfidando continuamente Kuroyukihime a scuola, e indagare sul sospettato principale, la sua migliore amica Chiyuri.
チユリを挑発する黒雪姫にハルユキは戦々恐々。しかし、その裏には彼女がハルユキを加速世界に誘った本当の理由が隠されていた。ある事件で加速世界の≪お尋ね者≫となっていた黒雪姫は、最近学内ネットワーク上で、本来なら受けるはずのない対戦を挑まれ続けていた。執拗に迫る蒼いデュエルアバター――シアン・パイルの正体を探るべく、ハルユキに助力を求める黒雪姫。その容疑者には、あのチユリが浮上する―。
Kuroyukihime necesita alcanzar el nivel 10 en el programa Brain Burst para reunirse con su creador y descubrir su propósito. Sin embargo, debe descubrir la identidad de Cyan Pile, un Burst Linker que la desafió y podría revelar su verdadera identidad como Black Lotus. Con la sospecha puesta en Chiyuri, Haru inicia una investigación que revela una conexión que podría llevar al descubrimiento de la identidad de Cyan Pile.
黑雪姬告诉了春雪关于Brain Burst的发展历史，也说出了自己不为人知的黑暗过去，她很感激春雪可以理解她当时的心情。黑雪姬拜托春雪寻找攻击自己的Cyan Pile，而头号的怀疑对象竟然是自己的好友小千，为了排除小千的可疑性，他就与小千进行直结并了解了对方的真正想法，而当小千被排除嫌疑的时候，春雪发现了惊人的秘密。
Um Avatar de Duelo chamado Cyan Pile está a tentar desafiar Kuroyukihime numa batalha no Accel World.
