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.

Romio is returning to his room after his shopping trip with Char when the head of the Inuzuka household and Black Doggy prefect, as well as Romio's brother, 'Airu Inuzuka' stands in his way. Airu raises concerns, and suspects Romio may be in contact with a White Cat girl. Romio, beholden to his brother, undergoes a week of surveillance. The problem is, that week coincides with Persia's birthday.