Yua Fu Oruma 4 (Dengeki Bunko) [Light Novel]

[Machine Translation] The AI ( Tosti ) was believed to be the mastermind behind a series of incidents targeting the Electronic Crimes Investigation Bureau. However, its developer is a person who does not exist anywhere in the world. Echika and Harold search for the true identity of the developer. Biga, who is no longer a hacker, joins the investigation in earnest, but he is unable to find any trace of the developer. Meanwhile, a murder case targeting Amicus occurs. The M.O. is very similar to that of Harold's former teacher, Sozon, who was slaughtered in a nightmare in Petersburg. ( This time, I must end it. ) Echika cannot hide her anxiety at the sight of Harold, who has lost his composure. Will her voice reach the heart of Harold, who is burning for redemption? The fourth volume of this authentic science fiction crime drama, which won the "Grand Prize" of the 27th Dengeki Novel Award, gets to the heart of the matter!

電子犯罪捜査局を標的とした一連の事件の首謀者とされたAI「トスティ」。しかしその開発者は世界のどこにも実在しない人物だった。開発者の正体を探すエチカとハロルド。ハッカーから足を洗ったビガも本格的に捜査に加わるが、一向に足取りを掴むことができない。そんな中、アミクスを狙った殺傷事件が発生。その手口は、かつてハロルドの恩師ソゾンが惨殺された「ペテルブルクの悪夢」と酷似していて―。「今度こそ、私が終わらせなければ」平静を失ったハロルドの姿に、不安を隠せないエチカ。彼女の声は、贖罪に燃えるハロルドの心に届くのか―。第27回電撃小説大賞“大賞”受賞の本格SFクライムドラマ、核心に迫る第4弾!