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
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https://yostar-pictures.co.jp/works/detail/2567/?lang=en