Chakuro is the 14-year-old archivist of the Mud Whale, a nigh-utopian island that floats across the surface of an endless sea of sand. Nine in ten of the inhabitants of the Mud Whale have been blessed and cursed with the ability to use saimia, special powers that doom them to an early death. Chakuro and his friends have stumbled across other islands, but they have never met, seen, or even heard of a human who wasn't from their own. One day, Chakuro visits an island as large as the Mud Whale and meets a girl who will change his destiny.
| Title | Air Date | Duration | ||
|---|---|---|---|---|
| Season 1 | Episode 1 | It Was the Entirety of Our Precious World | 2017-10-08 | 25 min |
| Season 1 | Episode 2 | Sinners of Falena | 2017-10-15 | 25 min |
| Season 1 | Episode 3 | I've Had Enough of This World | 2017-10-22 | 25 min |
| Season 1 | Episode 4 | Drown in Sand Alongside the Mud Whale | 2017-10-29 | 25 min |
| Season 1 | Episode 5 | I Don't Want to Run | 2017-11-05 | 25 min |
| Season 1 | Episode 6 | Tomorrow, I Might End Up Having to Kill Someone | 2017-11-12 | 25 min |
| Season 1 | Episode 7 | I Want to See Your Future | 2017-11-19 | 25 min |
| Season 1 | Episode 8 | Disappear from This World | 2017-11-26 | 25 min |
| Season 1 | Episode 9 | I Want to See Where Your Choice Leads | 2017-12-03 | 25 min |
| Season 1 | Episode 10 | I'm Setting Off on a New Journey | 2017-12-10 | 25 min |
| Season 1 | Episode 11 | It's Just a Dream | 2017-12-17 | 25 min |
| Season 1 | Episode 12 | I'm Glad I Was Born Here | 2017-12-24 | 25 min |
| Editing | Masahiro Goto | Editor |
| Camera | Yoshio Ookouchi | Director of Photography |
| Sound | Jin Aketagawa | Sound Director |
| Sound | Hiroaki Tsutsumi | Original Music Composer |
| Visual Effects | Haruko Iizuka | Character Designer |
| Visual Effects | Haruko Iizuka | Opening/Ending Animation |
| Visual Effects | Haruko Iizuka | Supervising Animation Director |
| Directing | Kyohei Ishiguro | Series Director |
| Visual Effects | Miyuki Ishida | Color Designer |
| Art | Miki Matsumoto | Prop Designer |
