第1話: 堕天使ルシファーが空から落下し、魔王レヴィアタンと出会う

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Maria Totsuka was praying in a chapel at Seiseki Girls' Academy when a black cross comes falling from the sky. On that cross, was a fallen angel, bearing the sin of pride, Lucifer. Maria attempt to tend to the angel, but the floor falls out and she disappears. Lucifer finds herself in the depths of hell, and runs into the Demon Lord of Envy, Leviathan. (Source: Crunchyroll)