I Kept Pressing the 100-Million-Year Button and Came Out on Top, Vol. 2 (light novel) - Syuichi Tsukishima - Bog

Time off? Hardly! During their month-long suspension from Thousand Blade Academy, Allen, Lia, and Rose volunteer for some freelance monster extermination to keep their swordcraft sharp. But as the three make names for themselves in the outside world, they remain unaware that an old enemy from Allen’s past is hot on their heels and out for blood… Things don’t let up when they finally go back to class, either. From duels with the Student Council to a chance reunion with his Ice King Academy rivals, the Reject Swordsman certainly has his work cut out for him!