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This show is set at Honn0ji Academy, a fictional high school in post-apocalyptic Japan that is dominated by its fearsome student council, led by Satsuki Kiryuin. The council members wear special uniforms called Goku Uniforms that grant them superhuman abilities, which they use to oppress the rest of the school's students and staff.

The story centers around Tsukimi Kurashita, a huge fan of jellyfish and a girl who moves to Tokyo to become an illustrator. She moves into "Amamizukan," an apartment complex that is full of diehard female otaku with a no-men-allowed rule.

The story follows Rico, an orphan who dreams of becoming a great cave raider, much like her mother, and solve the mystery of the Abyss. The Abyss is an unexplored enormous cave system inhabited by strange and wonderful creatures, along with mysterious artifacts.

There is a certain site that can be accessed at midnight. It is said that you will meet Hell Girl once you do.

Ai Enma once again returns as the Jigoku Shoujo, who uses Jigoku Tsuushin (Hell Hotline) to allow people to post their grudges on their tormentors, sending them straight to Hell. In exchange, the users of the website will end up in Hell after they die.

After the events of the 2nd season, Ai's three helpers, Ichimoku Ren, Wanyuudou and Hone-Onna live out their lives in relative peace. This is suddenly shattered when Kikuri returns to recruit them.