Rin is a shy, ordinary girl, worried because her breasts are slightly bigger than other girls’. One day, she is attacked by an evil organization but saved by Magical Valkyrie Frostia, a magical girl superheroine. When she discovers Frostia’s true identity, Rin joins her as a Magical Valkyrie to fight against evil.

Sumire Hiyama, better known as Frostia, is captured by the evil organization Hamelder. Although they’ve stripped her of her clothing, she maintains her determination and swears to destroy the enemy base. Meanwhile, Rin, feeling responsible for her kidnapping, seeks the help of Mii, a spirit, to find Sumire. Once at the base, Rin finds herself surrounded by a large number of enemies and is immobilized. No matter how many enemies are defeated, they keep appearing to rape the heroines.

Rin Himesato, known as Lilustear, is on a mission to rescue her friend Sumire Hiyama, who has been kidnapped by the evil organization Hamelder. Meanwhile, Kyouko Kishibe, another friend of Rin’s, intentionally gets herself captured by Hamelder to infiltrate their base and assist Sumire from the inside. The clues lead Rin to an abandoned shopping mall, which appears to be Hamelder’s hideout. To rescue her, Rin will have to endure violation by her enemies while doing everything she can to resist succumbing to pleasure.

The high command of Hamerder plans to eliminate Lilustear by sending the monster Brosh. He appears in a park during the day, attempting to kidnap civilians, but Lilustear stops him. She follows Brosh into an underground system, falling into a trap where her mobility is restricted. There, Brosh uses his sticky tongue to attack and rape Lilustear. She must find a way to escape and keep her determination intact.