|Date of Release||November 30, 2015|
|Previous Volume||Gosick BLUE|
|Next Volume||Gosick GREEN|
Victorica and Kazuya arrived at the new continent and went to live in the house of Ruri, Kazuya's older sister. Kazuya encourages himself to get their own home and job, and goes into the NY downtown with her. People of every race, the noise of the city, .... mysterious lives of people are everywhere in the town, which could be called "a mystery of the new continent". There, when he took his eyes off, she suddenly disappeared. While he runs all over NY to find her, she meets an unexpected person. Being asked for help, she tries to solve a mystery "Christmas truce murder case", and.... What is the truth derived by her superbrain "Spring of knowledge", and what is the true identity of the client!? The 3rd episode of the popular series!