Season 1

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  7.8/10943 votes

  The City of the Great Pit

  Season 1 Episode 1 - Aired 7/7/2017

  While exploring the Abyss, Riko comes across something she has never seen before. How does this new discovery impact her?

  Director: Hitoshi Haga

  Writer: Hideyuki Kurata

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  7.6/10842 votes

  Resurrection Festival

  Season 1 Episode 2 - Aired 7/14/2017

  Riko and Reg find out more about their past but the question still remains, who or what exactly is Reg?

  Director: Satoshi Mori

  Writer: Hideyuki Kurata

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  7.7/10811 votes

  Departure

  Season 1 Episode 3 - Aired 7/21/2017

  Reg goes on his first cave raid! Meanwhile, Riko makes preparations to go into the abyss to find her mother.

  Director: Unknown

  Writer: Unknown

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  7.6/10777 votes

  The Edge of the Abyss

  Season 1 Episode 4 - Aired 7/28/2017

  Riko and Reg start their adventure into the Abyss, while there they run into an unexpected familiar face.

  Director: Shinya Iino

  Writer: Unknown

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  7.7/10764 votes

  Incinerator

  Season 1 Episode 5 - Aired 8/4/2017

  Riko and Reg descend into the Forest of Temptation. What new dangers will they find laying in wait for them there?

  Director: Toshiharu Kudou

  Writer: Unknown

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  7.5/10764 votes

  Seeker Camp

  Season 1 Episode 6 - Aired 8/11/2017

  Reg and Riko make it to the Seeker Camp where they meet Ozen the Immovable, the person who saved Riko all those years ago. But there is more to Ozen than meets the eye.

  Director: Unknown

  Writer: Unknown

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  8.2/10801 votes

  The Unmovable Sovereign

  Season 1 Episode 7 - Aired 8/18/2017

  Ozen reveals more about the Abyss as well as the truth behind Riko's origins. What will happen when Ozen shows her true colors?

  Director: Shinya Iino

  Writer: Unknown

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  7.9/10762 votes

  Survival Training

  Season 1 Episode 8 - Aired 8/25/2017

  Ozen tasks Riko and Reg to survive alone outside the Seeker Camp. Do they come out alive and unscathed? Or does the Abyss have a dirty trick up its sleeve?

  Director: Shinya Iino

  Writer: Unknown

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  7.9/10744 votes

  The Great Fault

  Season 1 Episode 9 - Aired 9/1/2017

  Reg and Riko continue their descent after they leave Ozen's Seeker Camp. Riko's mettle is tested as Reg passes out and she has to fend for herself.

  Director: Unknown

  Writer: Unknown

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  9.2/101,118 votes

  Poison and the Curse

  Season 1 Episode 10 - Aired 9/8/2017

  Reg and Riko run into trouble deep in the fourth layer where they meet an interesting creature, but are they friend or foe?

  Director: Unknown

  Writer: Unknown

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  8.2/10779 votes

  Nanachi

  Season 1 Episode 11 - Aired 9/15/2017

  Nanachi sends Reg on a mission to find certain items that could possibly save Riko. Meanwhile, Nanachi reveals a little more about themself.

  Director: Toshiharu Kudou

  Writer: Unknown

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  8.5/10841 votes

  The True Nature of the Curse

  Season 1 Episode 12 - Aired 9/22/2017

  Nanachi shows Reg the truth about the Abyss. Meanwhile, Riko is still recovering from her injuries when she has a strange dream.

  Director: Masayuki Kojima

  Writer: Unknown

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  9.6/101,768 votes

  The Challengers

  Season 1 Episode 13 - Aired 9/29/2017

  Nanachi and Mitty's past is revealed. How did they become what they are and who is responsible for it? Meanwhile, Riko is on the mend after her injuries.

  Director: Satoshi Mori

  Writer: Hideyuki Kurata