Barrette Code : Firewall 2 (Dengeki Bunko) [Light Novel]

[Machine Translation] Despite the loss of many friends, Yuma Furuhashi and his friends survived the harsh battle in the cyberspace and returned to reality. However, one of the key players, Chitose Amemiya, a girl who is known as "Frostbiter" and who has pledged her future to Yuma, has experienced a certain change. Partial amnesia. She had lost her memories of Yuuma, whom she had nurtured during the battle. Yuma tries to face her again as a lover, but then a certain person appears. Amamiya Shiraa, Chitose's older sister and the most powerful woman in the cyberspace. In order to face the threat that will come again in the near future, Yuma looks up to Shiraa as his mentor and tries to train himself.

多くの仲間を失いながらも、電脳空間での過酷な戦いを生き抜き、現実へと帰還した古橋優馬とその仲間たち。しかしその立役者の一人、「フロストバイター」の異名を持ち、優馬と将来を誓った少女・雨宮千歳には、とある変調が生じていた。部分的記憶喪失。戦いの中で育んだ優馬との思い出を、彼女は失ってしまっていたのだ。改めて恋人として、彼女と向き合おうとする優馬だったが、そこにある人物が現れる。千歳の姉にして電脳空間最強の呼び声高い女性・雨宮白亜。近い将来、再びやってくるであろう脅威に立ち向かうため、優馬は白亜を師と仰ぎ、己を鍛えようとするが―。