Adult PC Game: Nagiyahonpo - Reona - The Changing hero v3 - Final - English version Archive

Overview:
Reona's party made it to the fortress of Demon Lord Stenga before getting wrecked by tentacles and reduced to Level 1.

With her last bit of strength Reona delivered a critical hit on Stenga with a poison-tipped sword.
Her team swept in and, spending a portion of their own life, revived Reona and fled from the demon castle to the sea, and then to a solitary island where men gather.