91 Days: Shoal of Time

91 Days: Shoal of Time is an original video animation released in 2017 that functions as a supplemental chapter to the 2016 anime series 91 Days. Produced by Studio Shuka, the project was developed to expand upon the atmospheric, prohibition-era revenge narrative established in the original television run, offering viewers further insight into the complex motivations of the protagonist, Angelo Lagusa. The production maintained the dark, noir-inspired aesthetic that defined the series, focusing on the internal psychological tension of the characters as they navigate the brutal realities of the mafia underworld.

The creative direction for the episode continued the work of director Hiro Kaburaki and writer Taku Kishimoto, who sought to maintain the gritty, cinematic tone that set the series apart from typical contemporary anime. By emphasizing shadow, muted color palettes, and deliberate pacing, the team aimed to craft a mood reminiscent of classic hardboiled crime dramas. Upon release, the episode was received by fans as a contemplative addition that deepened the series' exploration of grief and vengeance, reinforcing the project's reputation for serious, character-driven storytelling.