Dahlia Academy is a boarding school where the students come from two enemy countries: the Eastern Nation of Touwa, and the Principality of West. However, Romio Inuzuka, the first-year leader of the Touwa students, has always been in love with Juliet Persia, the first-year leader of the enemy West students. One day, Inuzuka decides to make his move and tell Juliet how he feels.

Another day, another confrontation between Touwa's Black Doggy House and the West's White Cats House. All the while, Inuzuka and Persia continue their secret romance. Then, the day of the tri-monthly outing to the town of Dahlia arrives. Inuzuka concocts a plan for a date with Persia. He disguises her in a Black Doggy boy's uniform. Things get spicy as they try to keep their date on the rails.

The Black Doggies have begun their training camp in preparation for midterms. Persia dons her "Julio" disguise and participates at Inuzuka's request. In charge of the camp is Inuzuka's childhood friend, Hasuki Komai. Inuzuka learns by chance that he's the reason Hasuki is so dedicated. Guilty about keeping his relationship with Persia hidden from Hasuki, Inuzuka gathers his courage.