Controlling her quirk was never easy. Mayumi Storms is a half-Japanese girl with a power that's equally troublesome as it is powerful. She inherited it from her father, but it seems more like a curse. She enrolled into U.A. High School in hopes of getting a handle on both of her powers, determined to make something good out of herself, no matter what's thrown her way.

The other Animorphs have been through more life-or-death situations than the average military defense teams in the United States. They thought they had seen it all with aliens secretly invading, but then the Yeerks discovered a weapon no one had anticipated: a girl roughly Jake's age. The only problem: she can't remember a thing. Will she be caught, or will the Animorphs intervene?