"Ojou-Sama Yomeiri Kousou!" follows Mamoru Amakawa, a transfer student who unexpectedly receives love letters from two girls—Sakura Sumiyoi, daughter of a gang leader controlling the northern city, and Ageha Kurosaki, daughter of the mafia leader ruling the southern city. These "two princesses" of rival criminal clans vie fiercely for Mamoru's affection, even to the point of armed conflict, creating a chaotic and passionate love rivalry. The story explores how Mamoru navigates this dangerous and sticky situation between the two powerful factions fighting over him.