Takasu Ryuuji might look like a thug, but he's actually a nice guy. Making friends when you've got an unintentionally scary face is tough--and don't even get him started on girlfriends. But with his secret crush in his class, the start of his second year of high school is off to a good start...until he crosses paths with Aisaka Taiga. Beautiful, frightening, and not quite five feet tall, the girl known as the palmtop tiger is the one person in school even scarier than Ryuuji himself--and he's just made the mistake of making her very, very angry.

Sagara Sousuke isn't your typical high school student. He reads military enthusiast magazines; he responds to questions with "affirmative;" he brings grenades to school in his bag. Though everyone at school takes him for a hopeless military geek, Chidori Kaname thinks there might be something more to him. When their plane is hijacked in the middle of a field trip, Kaname's instincts will prove correct: Sousuke is an elite, mech-piloting mercenary... and he's here to protect her!

Adachi is skipping class when she first meets fellow truant Shimamura in the gym loft, and just like that, a friendship is born. Except now Adachi's having dreams about kissing her, and she doesn't know what that means, but she's pretty sure it's not something you do with a friend.

Juliette Contzen is a lazy, good-for-nothing princess. Overshadowed by her siblings, she's left with little to do but nap, read, and occasionally cut the falling raindrops with her sword. Spotted one day by an astonished adventurer, he insists on grading Juliette's swordsmanship, then promptly has a mental breakdown at the result. Soon after, Juliette is given the news that her kingdom is on the brink of bankruptcy. At the threat of being married off, the lazy princess vows to do whatever it takes to maintain her current lifestyle.

Mukouda Tsuyoshi was nothing special in modern Japan… So when he was summoned to a world of swordplay and sorcery, he thought he was ready for the adventure of a lifetime. Too bad the kingdom that summoned him only got him by mistake! Not only was he not one of the three summoned heroes, but his stats were laughable compared to theirs. On top of that, there's something really sketchy about this kingdom…