ENNEAD
So since it's old mythology everything is a little incesty but that's just how mythology works so it's fine. Seth, the god of war and the desert killed his brother Osiris and became king of Egypt. But his rule was bloody and evil. Then the son of Osiris, Horus, shows up with his mother Isis and challenges Seth for the right to the throne of Egypt by seeing who is the victor of three challenges judged by the other gods. Basically, Horus is in love with Seth but still wants to beat him (kinda) at these games. Anubis, deals with his daddy issues. Seth can't get over what his brother Osiris did to him and has been living in fear this whole time. Isis is a controlling mother type.
Houtou Musuko to Koi no Ana