Retrospective event's official trailer of ARKNIGHTS "LINGERING ECHOES" is produced by Yostar Pictctures.

Original Title: Mobile Game ARKNIGHTS
Title: ARKNIGHTS Retrospective Event “LINGERING ECHOES” Animation Official Trailer
Narrated by:Yuka Iguchi[Hibiscus the Purifier]

Published by: Hypergryph / Studio Montagne
Cooperation: Arknights Development and Management Team