Animated commercials for the tower defense mobile game Arknights, made to advertise the game and its events following its Japanese release. The shorts were broadcast on television and also shared through the game's YouTube channel and on Twitter. Releases begin in January 2020 with an official animation trailer and continue at least into mid 2023. Several tie in to numbered story chapters, such as the fifth, sixth and seventh, while others promote in-game events like Heart of Surging Flame and Invitation to Wine. Expect action fantasy delivered in short promotional pieces.