Nuki Doki! Tenshi to Akuma no Sakusei Battle

Based on the erotic game by Grand Cru Bourgeois. Angels and Demons like "Naruse Mio" have been fighting for a long time to see who is in charge. In order to bring the closure to this feud. an angel named Sera and a demon named Firika sent to the human world to complete this competition. The leaders