Gelegen in het midden van een afgelegen eiland, is de Abyss het laatste onontdekte gebied, een enorm en verraderlijk peilloos gat bewoond door vreemde wezens waar alleen de dapperste avonturiers afdalen op zoek naar oude relikwieën. In de bovenste verdiepingen van de Abyss komt Riko, een meisje dat ervan droomt ontdekkingsreiziger te worden, een mysterieus jongetje tegen.
| Art | 上田瑞香 | Art Designer |
| Production | 渡邊 耕一 | Executive Producer |
| Production | Hiromichi Uchibayashi | Producer |
| Production | 田中翔 | Executive Producer |
| Production | Keisuke Sugawara | Associate Producer |
| Sound | Riko Azuna | Theme Song Performance |
| Sound | MYTH&ROID | Theme Song Performance |
| Production | 高麗大助 | Executive Producer |
| Production | 榊原光広 | Executive Producer |
| Art | 高倉武史 | Art Designer |
| Sound | Hiromitsu Iijima | Music Producer |
| Art | 平柳悟 | Art Designer |
| Art | Takumi Sakura | Prop Designer |
| Art | 関口輝 | Art Direction |
| Visual Effects | Yuka Kuroda | Character Designer |
| Production | Sojiro Arimizu | Producer |
| Production | Chisaki Hirano | Associate Producer |
| Production | 後藤 明信 | Executive Producer |
| Production | 篠崎文彦 | Executive Producer |
| Production | 隈元優介 | Producer |
| Editing | 谷口和己 | Online Editor |
| Production | 山崎明日香 | Executive Producer |
| Art | 高山祐一 | Assistant Director of Photography |
| Production | 竹中信広 | Producer |
| Sound | Toshihiro Hayano | Sound Recordist |
| Sound | 山田陽 | Sound Mixer |
| Production | 礒谷徳知 | Producer |
| Production | 木村淳 | Producer |
| Editing | 石井知 | Online Editor |
| Sound | Kevin Penkin | Conductor |
| Production | 山下愼平 | Producer |
| Sound | 山田陽 | Sound Director |
| Sound | Kevin Penkin | Original Music Composer |
| Directing | 小島正幸 | Series Director |
| Art | 増山修 | Art Direction |
| Writing | つくしあきひと | Comic Book |
| Editing | 黒澤雅之 | Editor |
| Visual Effects | Miyao Yamashita | Color Designer |
| Writing | 倉田英之 | Series Composition |
| Visual Effects | 黄瀬和哉 | Character Designer |
| Directing | 垪和等 | Assistant Director |
| Camera | 江間常高 | Director of Photography |
| Sound | 野口透 | Sound Effects |
