This romantic comedy is about Takeru Ohyama, a typical perverted teenage boy. His new school doesn't require entrance exams, and it just turned co-ed! Unfortunately, his dreams of a happy high school life are dashed when he finds out the school is much more than it seems. All of the students wield a special item—a Maken—to unleash their magical abilities in duels! Can Takeru find a Maken that works for him? Even while trying to fit in at a new school and dealing with all kinds of girl problems?

When Kouichi arrives at his new school, he immediately senses something frightening in the atmosphere of his new class, something that no student wants to talk about and that seems to be related to a mysterious and silent girl.

Follow the adventures of three ordinary girls as they make life’s awkward moments a thousand times worse. Along with a colorful bunch of classmates, they learn their most important lessons the hard way. Meanwhile down the street, a pocket-sized professor makes life difficult for a robot who just wants to be normal. But normal is the last thing you can expect in a town where salmon falls from the sky. In fact, the only thing you can count on is your friends, but even they are totally weird.

Kimizuka Kimihiko is a crisis-magnet. So it is no surprise when his rather mundane flight suddenly enters a state of emergency with a dire need of a detective onboard. Unfortunately, his attempt at avoiding trouble is foiled by a beautiful girl with silver hair who goes by the codename Siesta. Declaring herself a detective, she unceremoniously drags Kimizuka into the case as her assistant. That incident spelled the beginning of an adventure around the globe that went beyond his wildest imagination. Putting their lives on the line, the two took down criminal organizations, prevented disasters, and saved thousands. But the curtain closed to their epic journey with Siesta's untimely death three years later. Resolving to live an ordinary high school life this time, Kimizuka spends a year maintaining a low profile. However, as fate would have it, a girl with an uncanny resemblance to Siesta comes crashing into his life, threatening to throw his peaceful days into disarray.

At Seishou Academy, girls don’t just wield guns— they ARE guns! In a school where every girl is a lethal weapon gunning for the chance to get their own personal serviceman, more than a few shots are about to be fired between Funko and her classmates. And when their newly recruited human instructor, Genkoku, arrives, he’ll have to learn how to deal with this living arsenal of high caliber cuties if he doesn’t want to get caught in the crossfire of their hair trigger tempers!

The story revolves around a new team of "Toei robot girls" named "Team Z" that is made up of three girls based on Toei's Mazinger Z franchise: Mazinger Z, Great Mazinger, and UFO Robot Grendizer. Usually they perform in activities around Nerima ward in Tokyo to raise the awareness of the promising future energy source "Photon Power" (koushiryoku). However, there are times when "Mechanical Beast" team of girls emerge from the "Subterranean Empire" and attempt to steal the energy. Thus "Team Z" has to battle them to prevent this, though sometimes they just go and beat up the "bad girls" to relieve stress.

While the title suggests a story of simple, everyday school life, the contents are more the opposite. The setting is a strange school where you may see the principal wrestle a deer or a robot's arm hide a rollcake. However there are still normal stories, like making a card castle or taking a test you didn't study for.