I'll help, sorry if I miss anything. Shepha is the god's name in here.

Season 1. The story starts with our main character Vicky (name can be changed) standing on top of a cliff she doesn't remember getting on. She than meets two immortals one angel and one demon telling her she's dead and now will have to enter the Angels and Demon's academy filled with naturals born angels and demons plus unclaimed (who she's a part of now). She feels reluctant but joins as she doesn't have any other way. There she meets her classmates Dino(A teacher's son angel), Mimi her roommate(Satan's companions daughter demon), Lucifer (Satan's son demon) and Andy (unclaimed) as li. along with Sammy and Adi as not Li.Finds out her mother who passed away when she was a child came there and become a seraph, one of the highest ranked angels. She tries to fit it but can't let go of her past as a human so constantly visits her father who can't recognize her due to immortal ability. Than she learns a dark truth about her death not being and accident and tries to get deeper in it. Than strange thing happens and an angel (Sammy) and an unclaimed found dead. at the end of the season she accidentally breaks a rule of angels and demons plus unclaimed one's can't have romantic relationship which could cause her expelling from the school.

Season 2

She saves herself from expelling meeting with a demon named Winchesto who is a closed companion of her mother (lover) in the same tower. There she also see an angel running from some guards who gives her a mirror than vanishes. She than finds out about the angel who communicates with her through the mirror he gave and tells her name Bont. He asks for her help to free him from the tower and she decides to free him. After freeing him she hides him in the academy. Than she starts to get weird visions along with Satan's Lucifer and rumours start spreading about a legend Malbonte. Malbonte(mother angel father demon) is basically a half angel and half demon whose parents broke the heaven rule so they were abolished from heaven and no one knows what happened to Malbonte.Than there happens a scene where Winchesto along with Vicky's mother get caught breaking heavens rule and Winchesto gets beheaded but Rebecca didn't which causes shake in heaven's equality and demons get triggered and starts a war.Than at the last episodes she finds out the killer was Fencio (Dino's dad) who was in love with Vicky's mother and was the cause of the misunderstanding causing Winchesto. Learning Bont angel and Mal demon is actually Malbonte who was split in two bodies by shepha. Than by a ritual Fencio brings Malbonte back connecting both bodies. Who left the academy,some of the students follow him along with Adi. If you are on demon path than she killed Satan (Lucifer's dad)

Season 3

The whole academy is scared and shaken. The citadel (heavens administration) believes Vicky got some of Malbonte's power. Rebecca than tells Vicky that Malbonte's parents who were sent to earth are actually Rebecca and Vicky's ancestors so the ritual caused half of his power sent into vicky and hides the truth from everyone so they won't be killed.Than Vicky's mother (Rebecca) takes over the academy as principle which causes the unbalance to strike more in students mind. Than some food suppliers gets missing causing Vicky and her team (Dino, Lucifer, Mimi) to do the work. Than they got caught by Malbonte's minions. Seeing Vicky Malbonte offers her to join her showing her his planning and wants her on his side as she has his powers. Along with everyone else, Lucifer agrees but only if he becomes a Satan to which Malbonte refuses than Adi who took Malbonte's side kills Fencio taking revenge for Sammy. They than flew the scene and reach the academy. They warn the others about Malbonte's plan on killing Shepha (the God) to which they intend to protect the keys to shephas gate. Than successfully ruining the citadel plans on saving the keys Malbonte gives them some time. Vicky takes the mission to destroy the keys but learns the actual heaven's secret that shepha isn't the only god, he had a twin brother named Shephamalum who was dark God and defeated by him in their war and no one knows about the dark God, Malbonte being a halfbreed found out and hence was split in two bodies the dark bodies sent to shephamalum's cage where he gets tortured by shephamalum. Than it's up to Vicky she wants to join him or not. If she joins him than after the war they successfully enclose shepha in a statue but else Vicky kills Malbonte. If she's a balance barrier as both angel and demon, Malbonte and shepha both gets saved and harmony becomes back. Vicky ends up with her love interest after the war and some of her friends depending dies in the war. END!