Is It Wrong to Try to Pick Up Girls in a Dungeon? On the Side: Sword Oratoria, Vol. 20 (manga) — Fujino Omori

Intelligent monsters, the Evils, the Hestia Familia and Aiz's Loki Familia. Head of the latter, Finn alone is calm amid the chaos. In this clash of wills, what path will Finn take? Unwilling to abandon her anti-monster philosophy, Aiz moves to stop Bell, but she finds her path blocked... The battle with the mysterious gale swordsman begins!