Rin learns from the spirit Mii that the Hamerudah are energy-stealing monsters who target women to fuel their conquest. Determined to rescue the captured Hiyama-senpai, Rin transforms into the magical battle maiden Lyristia and confronts the enemy in the city. However, she is quickly overwhelmed by a swarm of grunts who attempt to drain her energy through sexual assault. Although she manages to convert their mana into a powerful counterattack and locate the enemy base, Lyristia is left physically exhausted and desperate to find a way to save her friend.