Ryou wonders why Touma is so obsessed with keeping promises as they try to figure out how to save Sora.
| Title | Because of That Opened Book |
|---|---|
| Genres | Action & Adventure Sci-Fi & Fantasy Drama |
| Release Date | 2020-09-27 |
| Episode Runtime | 00 Hours 24 Minutes |
| Season Number | 31 |
| Episode Number | 4 |
| Production Companies | TV Asahi, Toei Company, ADK, Ishimori Production |
