Hayate's twin sister, Kurogane Nagi, returns to school and insists that she should pair up with Ayana. Hayate, who does not deny this, causes Ayana's anger to explode! Fleeing, Hayate encounters Yagyu Makoto, a swordsman student about to graduate, in the mountains of Tenchi Academy. Meanwhile, the student council president, Tenchi Hitsugi, is preparing for the graduation farewell event "Great Capture!" The curtain rises on a battle royale involving all the swordsman students――!!