Sword Art Online 12 (light novel): Alicization Rising — Reki Kawahara

It's been two years since Kirito entered another mysterious fantasy world and met the boy named Eugeo. At the Northern Centoria Master Swordsmanship Academy, the two of them have advanced to become upper rank trainee swordsmen. Now they spend their days training, aiming to one day earn the rank of Integrity Knight, the greatest peacekeepers in the human world. Soon, appropriate for their new ranks, both Kirito and Eugeo are assigned apprentices and they all deepen their bonds while perfecting their bodies and minds. But suddenly, an evil rears its head and threatens their peaceful lives. Eugeo tries to draw his sword to fight but he finds himself helpless as a message appears in words he can't read. They say--SYSTEM ALERT.