A strong desire to protect, but the "courageful person" awakens the [hero]! The bottom-of-the-line adventurer, Renya, is trying to be strong enough to protect his family. In order to strengthen the A rank party luggage, he participated in the capture of the Demon King Castle as a baggage, but he was betrayed by the members and in mortal danger of life ...! When I despaired that it would end in such a place, the encounter with the daughter of the demon king awakens Renya's skills! The most courageous adventurer at the bottom, with his friends in reverse fantasy opening!