To save the Earth from alien invaders and their giant monsters, Dr. Kishida does what any other red-blooded mad scientist would do: he builds a giant robot—the ultimate feminine fighting robot! Unfortunately, his grand-daughters refuse to pilot it! Apparently, they've got more important things to do than becoming teenage super-heroes. Besides, how are you supposed to study for your college entrance exams while getting beaten-up in battle? Fortunately for Dr. Kishida, things aren't too well for the invaders, either. According to their reports, the Earth was the perfect target: lush, peaceful, and relatively defenseless. Theoretically, the planet should've surrendered long ago. Now, the war is at a standstill, the dreaded Accounting Department is warning about the serious cost overruns, and the head of the home office has arrived from Galactic Headquarters to personally oversee operations. Has Headquarters decided to unleash, The Audit—or do they have something even more evil in mind? The fate of the world rests upon two people: Aya Kishida, one of the doctor's granddaughters, who may have to give up prep school to pilot the mighty (and lovely) ARIEL; and a mysterious alien named Saber Starblast, who may have the power to defeat the invaders once and for all...

According to Kadokawa, an OVA of R-15 will be bundled with the tenth volume of the novel.

Yuji and Koichi set off on a journey to find a rare bamboo flower for a school project. In the forest they encounter a legendary phoenix who asks for their help to save the forest.

One day Kan-chan finds a magic bottle in the attic. Whenever someone sneezes, a genie named Hakushon Daimaou is brought out and must grant any wish of whoever sneezed until he or she sneezes again. Sometimes, however, he accidentally fails and only causes trouble instead of granting any wishes.