This is a strange and wonderful series. The gist of it, from my POV, is a view of western religious constructs through the prism of non-western/ non-Christian eyes. What you get then is a very funny, surreal, old MGM Tom and Jerry-style, comedy about a witch living with a demon from Hell ("Jashin-chan") who must kill the witch in order to return to Hell.
The witch, Yurine, lives in a tiny apartment in the city and has several devil friends in her circle, and even owns a devil dog named "Beth". Yurine has a totally dead-pan personality, and excels at wreaking bloody vengeance on Jashin-chan after her epic bouts of deceit, selfishness, bullying, etc. or her many failed attempts to kill Yurine. Viewers get to meet the other Lolli Devils in Yurine's circle of friends (such as "Medusa" and "Minos" and the Ice-Devil sisters), and meet couple of fallen Angels ("Pekola" and "Poporon"). Pekola is a devout Angel who has lost her halo and is trapped on Earth, where she practices her faith by living in a cardboard box and starving herself to death. She is constantly wracked by the conflict within her from accepting acts of compassion from the witch Yurine and her Devil-friends versus being true to her mission as an Angel to oppose and destroy them. Poporon is a devious Angel who is the mirror image of Jashin-chan, ..but whereas Jashin-chan is mean and devious on the outside (but actually caring on the inside), Poporon is outwardly "good" but inwardly devious and mean. Quite the contrast.
Damn, I hope they do a second season!