Set in 2045, humanity struggles to survive in a world overrun by mysterious invaders called the Irousu. The Earth's only hope lies with the students of Shinjugamine Girls' Academy, a school where Star Guardians train to fight the Irousu. Together, these brave girls work to develop their skills to fight against the invaders… provided they can pass class first!
Miki, Haruka, and Subaru get a surprise assignment from their teacher. Meanwhile, Urara and Kokomi have some problems of their own.
A new Hoshimori is introduced to the ranks. As Misaki learns how their operation works, the others try to hone their skills to catch up to her.
The girls head to the beach for a special training camp. The training is brutal, but their extra summer activities might be even worse, especially when an Irous attacks.
A streak of bad luck puts the success of the Fortissimo concert in jeopardy. With their performance on the line, Kanon and Shiho ask the other girls to stand in as staff.
In an effort to understand Misaki, Kurumi approaches her in the bath. Meanwhile, Yuri and Nozomi reminisce about their early days as a Hoshimori team.
After a particularly rough fight, Kurumi and Renge wake up and discover that they've switched bodies! Renge might be enjoying it too much... what will it take to switch back?
Someone has been watching the Hoshimori girls from the shadows. A new Irous may be too strong for Haruka, Subaru, and the other girls to handle.
While the other girls enjoy their vacation, Haruka and Miki are forced to stay back to watch for Irous. Meanwhile, the other girls try to enjoy a day out.
It's time for the Shinjugamine Girls School Culture Festival! Their contribution: a play loosely based on Little Red Riding Hood.
After proving themselves in the last attack, the girls are allowed to take a small vacation and visit their homes! Misaki, however, learns that the danger is far from over.
With Misaki's true past revealed, the girls prepare to face a powerful foe. As the puppet master behind the chaos begins her final play, Misaki takes on the danger by herself.
Their black-hooded enemies from another world prove stronger than the Hoshimori class thought. It's up to Misaki and Miki to make it to the Wicked Tree before its too late.