5LOST GIRLS tells of the times and spaces in between the plot points, through the eyes and ears of the saga's toughest--but more taciturn--heroines. What they thought, and felt, and did on and off stage come to the fore via a medium distinctly suited to conveying interiority: language.

The two novella-length offerings were originally included as bonus features in the initial Japanese Blu-ray releases, while the introduction and the titular story are unique to the book. A manga rendering of this official spinoff is slated to appear stateside from Kodansha Comics.

The writer of many of the episodes of the smash hit animated series Attack on Titan, Hiroshi Seko has served as the scenarist for the small-screen adaptations of other popular franchises such as Seraph of the End and Ajin: Demi-Human.