Bring all characters to modern time. Where they became a students of St.Francesca Academy. They set group and and competing with each other. Who win will take the student council president place. Koumei, a new transfer student to St. Francesca Academy, is asked by Kan'u to join her team to help her win the contest that will decide the new president of the student council.

The story takes place at St. Francesca Academy. After the battle between the students ended, they all go to a southern island.

Shin Koihime†Musou characters sing theme songs on stage at a live event.

Shin Koihime†Musou: Otome Tairan OVA.