Trivia / Unlock City

• Author Phobia: According to the author's note in the back of the book, mothy has found the idea of locks not working to be pretty unsettling since childhood, and was part of the inspiration for the book.
• Creator's Oddball: Not so much in terms of genre as he's no stranger to mystery and horror, but is considered this for mothy by fans for not only a distinct lack of Vocaloid involvement but also an absence of high fantasy elements, placing events in modern, real-world Japan.