デュラララ!! 外伝!?

From Author Wars - https://authorwars.com/books/deyurarara-wai-chuan-3320262.html

Overview:

Title: デュラララ!! 外伝!?
Author: 成田良悟
Year: 2014
Type: Collections
Series: デュラララ!! / Durarara!!
Number in Series: 14

Variant Titles:

2024. Durarara!! Side Stories?!