Kishuku Gakkou no Juliet

Synopsis

Inuzuka jumps out of the window, having realised Persia was on the balcony and she catches him. Inuzuka finally wishes Persia Happy Birthday and Persia admits she loves him. Airu arrives but before he can locate Inuzuka, he and Persia pie each other in the face and declare their fight a draw. However, Airu publicly confronts Inuzuka with Persia's rosary and other evidence and accuses them of being lovers. Persia quickly accuses Inuzuka of trying to make a fool of her and challenges him to duel with real swords. Airu still does not believe them so Inuzuka and Persia decide they must actually wound each other to stay together and stab each other in the chest. Later it is revealed they actually stabbed each other in the rosaries they were both wearing, destroying them. With the school now convinced they’re enemies Inuzuka secretly gives Persia matching rings and declares that before changing the world he will change the school by becoming a prefect. The school returns to normal. Airu, despite still being suspicious, allows Inuzuka to become a student council errand boy as his first step on the road towards becoming a prefect. On their next secret date while wearing their matching rings Persia and Inuzuka decide that one day, when they have nothing to fear, they will call each other by their first names, Romio and Juliet.

(Source: Wikipedia)