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.
| Production | 田中翔 | Executive Producer |
| Production | 渡邊耕一 | Executive Producer |
| Sound | Riko Azuna | Theme Song Performance |
| Sound | MYTH&ROID | Theme Song Performance |
| Production | 後藤 明信 | Executive Producer |
| Production | 山崎明日香 | Executive Producer |
| Art | 高倉武史 | Art Designer |
| Sound | 飯島弘光 | Music Producer |
| Production | 榊原光広 | Executive Producer |
| Art | 関口輝 | Art Direction |
| Art | 沙倉拓実 | Prop Designer |
| Visual Effects | Yuka Kuroda | Character Designer |
| Production | 高麗大助 | Executive Producer |
| Production | 篠崎文彦 | Executive Producer |
| Production | 有水宗治郎 | Producer |
| Production | Hiromichi Uchibayashi | Producer |
| Production | 隈元優介 | Producer |
| Editing | 谷口和己 | Online Editor |
| Production | 平野千咲 | Associate Producer |
| Production | 菅原啓介 | Associate Producer |
| Art | 平柳悟 | Art Designer |
| Art | 上田瑞香 | Art Designer |
| Art | 高山祐一 | Assistant Director of Photography |
| Editing | 石井知 | Online Editor |
| Sound | 山田陽 | Sound Mixer |
| Directing | 垪和等 | Assistant Director |
| Writing | 倉田英之 | Series Composition |
| Visual Effects | 黄瀬和哉 | Character Designer |
| Writing | つくしあきひと | Comic Book |
| Sound | 野口透 | Sound Effects |
| Art | 増山修 | Art Direction |
| Editing | 黒澤雅之 | Editor |
| Visual Effects | Miyao Yamashita | Color Designer |
| Camera | 江間常高 | Director of Photography |
| Sound | Kevin Penkin | Original Music Composer |
| Directing | 小島正幸 | Series Director |
| Sound | 山田陽 | Sound Director |
| Production | 山下愼平 | Producer |
| Sound | Kevin Penkin | Conductor |
| Production | 礒谷徳知 | Producer |
| Production | 竹中信広 | Producer |
| Production | 木村淳 | Producer |
| Sound | 早野利宏 | Sound Recordist |
