Located in the center of a remote island, the Abyss is the last unexplored region, a huge and treacherous fathomless hole inhabited by strange creatures where only the bravest adventurers descend in search of ancient relics. In the upper levels of the Abyss, Riko, a girl who dreams of becoming an explorer, stumbles upon a mysterious little boy.
 | Season 1 Episode 1 Town of the Large Hole Air Date: 2017-07-07 Duration: 30 min |
 | Season 1 Episode 2 Resurrection Festival Air Date: 2017-07-14 Duration: 30 min |
 | Season 1 Episode 3 Departure Air Date: 2017-07-21 Duration: 30 min |
 | Season 1 Episode 4 The Edge of the Abyss Air Date: 2017-07-28 Duration: 30 min |
 | Season 1 Episode 5 Incinerator Air Date: 2017-08-04 Duration: 30 min |
 | Season 1 Episode 6 Seeker Camp Air Date: 2017-08-11 Duration: 30 min |
 | Season 1 Episode 7 The Unmovable Sovereign Air Date: 2017-08-18 Duration: 30 min |
 | Season 1 Episode 8 Survival Training Air Date: 2017-08-25 Duration: 30 min |
 | Season 1 Episode 9 The Great Fault Air Date: 2017-09-01 Duration: 30 min |
 | Season 1 Episode 10 Poison and the Curse Air Date: 2017-09-08 Duration: 30 min |
 | Season 1 Episode 11 Nanachi Air Date: 2017-09-15 Duration: 30 min |
 | Season 1 Episode 12 The True Nature of the Curse Air Date: 2017-09-22 Duration: 30 min |
 | Season 1 Episode 13 The Challengers Air Date: 2017-09-29 Duration: 30 min |
| Directing | Shinya Iino | Assistant Director |
| Sound | Miyu Tomita | Theme Song Performance |
| Visual Effects | Kazuchika Kise | Character Designer |
| Art | Osamu Masuyama | Art Direction |
| Writing | Hideyuki Kurata | Series Composition |
| Art | Takeshi Takakura | Prop Designer |
| Sound | Mariya Ise | Theme Song Performance |
| Editing | Masayuki Kurosawa | Editor |
| Visual Effects | Miyao Miyashita | Color Designer |
| Visual Effects | Kou Yoshinari | Creature Design |
| Sound | Toru Noguchi | Sound Effects |
| Camera | Tsunetaka Ema | Director of Photography |
| Sound | Haru Yamada | Sound Director |
| Directing | Hitoshi Haga | Assistant Director |
| Writing | Akihito Tsukushi | Comic Book |
| Sound | Kevin Penkin | Original Music Composer |
| Directing | Masayuki Kojima | Series Director |
| Directing | Masayuki Kojima | Director |
