How NOT to Summon a Demon Lord (Manga) Vol. 13 (Kobo eBook)
The invasion of Zircon Tower heats up! Faced with the Fallen's overwhelming military might, the defenders of the city, led by Laminitus, seem to be cornered...until Diablo, his crew, and his powerful lightning magic appear! Decked out in new gear from his dungeon, the Demon Lord is ready for his comeback!