Seven Mortal Sins

Seven Mortal Sins, also known as Sin: The 7 Deadly Sins (sin 七つの大罪, Shin: Nanatsu no Taizai), is a Japanese anime television series produced by Artland and TNK that aired from April 14, 2017 to July 29, 2017. It is an adaptation of Hobby Japan's media franchise The 7 Deadly Sins (七つの大罪, Nanatsu no Taizai), which primarily consists of a series of fantasy figures.

Plot
Lucifer, one of God's archangels, is denounced for rebelling against the Almighty's will and exiled from Heaven. She is forced into a brief stopover by crashing into a highschool's church, where a young girl, Maria Totsuka, witnesses her arrival. After Lucifer has infused the girl with a part of her angel's blood, she continues her fall into the depths of Hell, where she is met by Leviathan, the aspiring minor Demon Lord of Envy.

Soon after, Lucifer is challenged by the Seven Sins, the ruling Demon Lords of Hell, led by Belial. Bundling their powers, the Seven Sins overcome Lucifer and seal away her angelic powers by fitting her with a cursed Garb of Punishment, thereby turning her into a Demon Lord. Swearing revenge on her defeaters, Lucifer returns with Leviathan to Earth, where she turns Maria into her immortal slave. With her two sidekicks in tow, Lucifer sets out to defeat the Seven Sins one at a time in order to sunder their powers imbuing her Garb.