According to unverified summaries from the early 2000s, 15 Bishoujo Hyouryuuki was described as a survival-adventure game developed by a now-defunct "doujin" (fan-made) circle known only as "Mugen Kōbō" (Limitless Workshop).
– A paper from the University of Tokyo’s Department of Media Studies cites the game’s “dual‑timeline” mechanic as a novel case study in non‑linear narrative design .
According to unverified summaries from the early 2000s, 15 Bishoujo Hyouryuuki was described as a survival-adventure game developed by a now-defunct "doujin" (fan-made) circle known only as "Mugen Kōbō" (Limitless Workshop).
– A paper from the University of Tokyo’s Department of Media Studies cites the game’s “dual‑timeline” mechanic as a novel case study in non‑linear narrative design .