Hero Is Overpowered but Overly Cautious, Vol. 4 (manga)

No sooner have Seiya and his friends made it back from Dragon Village than it's time for them to face a new enemy--the Demon Lord's army's absurdly fast airborne strike force! And when they save the beautiful knight Rosalie, captain of the Roseguard Imperial Knights, from this horde of demonic flies, her hot-blooded personality is sure to put her at odds with the legendarily cautious Seiya...