Nuki Doki! Tenshi to Akuma no Sakusei Battle

Synopsis

For centuries, angels and demons have waged an endless war for supremacy. To settle this conflict, the angel Sera and the demon Firika are sent to the human world to decide the outcome. Their mission is to win the heart of a human named Yamato. The leaders of both factions have declared that the race whose representative earns Yamato's affection will achieve dominance over the other. Thus, Sera and Firika engage in a bitter rivalry for Yamato's love, with the fate of their respective races hanging in the balance.