Battle Girl High School Part 1: Believe (Light Novel)

In the year 2045, mysterious invaders called the Irous have attacked the planet, and humanity struggles to survive as they overrun the land. The Earth’s only hope against this new enemy that threatens humanity? Super-powered schoolgirls, of course! Shinjugamine Girls Academy is a school that trains girls called Star Guardians to fight against the Irous. Together, these brave girls work hard day in and day out in intense training so they can protect the Earth all while trying to enjoy their school life!
In Part 1, things suddenly get serious when a mysterious new recruit named Sadone joins the girls. It seems like she may be hiding something, but what could it be?
Notice: This book is written in Japanese.