The Demon Sword Master of Excalibur Academy, Vol. 2 (manga)

After a lively party welcoming Leonis into the eighteenth platoon, he and Riselia visit a nearby orphanage. The kids there are overjoyed to play with their big sister and new big brother…but the fun doesn’t last long. A sudden Stampede of Voids stops them in their tracks, and what’s more, Riselia is abducted! Now it’s up to the reincarnated Dark Lord to take back his minion—and perhaps face off against some familiar faces from his past