A samurai is worried about the fact that his wife always seems to wear a forced smile whenever she’s with him.

Mounted warriors line up and rush to the assault. Brandishing swords on horseback, the warriors slash at each other… This kind of image of feudal combat is all a lie. Well, then, how did Samurai really fight? A declaration of war has now been made against the lie of combat that was forged during the Edo period, and continued uncontested to this very day.

A military test accidentally sends a modern-day army back in time to feudal Japan. When their actions in the past begin to have an effect on the present, another unit is dispatched to retrieve them. But the commander of the lost unit has other plans: He wants to use his advanced technology to conquer Japan and change his country’s destiny.

Despite being half-brothers, Robert and Emile met each other just three years ago when they both started working for the Emperor. Robert is the Captain of the Royal Guard despite still being 17, while the younger Emile is a member of the Guard. But things never go smoothly for the newly-united brothers, because the Emperor is always willing to throw troublesome jobs their way…

Avenging his father’s murder is a matter of honor for the young samurai Jintetsu. But it turns out that the killer is a corrupt government official–and now the powers that be are determined to hunt Jintetsu down like an animal. There’s only one problem: Jintetsu is already dead. Torn to pieces by a pack of dogs, Jintetsu’s ravaged body has been found by Genkichi, outcast and master inventor. Genkichi gives the dead boy a new, indestructible steel body and a talking sword–just what he’ll need to face down the gang that’s terrorizing his hometown and the mobster who ordered his father’s hit. But what about Otsuki, the beautiful girl he left behind? Steel armor is defense against any sword, but it can’t save Jintetsu from the pain in his heart.

The main character Udagawa Gosuke has inherited his father’s dojo, mainly because his father and elder brother were made to commit hara-kiri. He wasn’t really supposed to get it simply because he’s a second son.

Due to the way his father and brother died, he doesn’t have a whole lot of self confidence, so he practices fencing daily at a nearby dojo.

However, because the people at that dojo are asses, he soon tries to invent a dojo and a style for people who just want to enjoy themselves.

However, what really sets this aside from most shounen is that the male and female main characters are actually married.

His wife, Udagawa Shino, is the younger sister of his senpai, and is a bit… weird, to say the least. She makes rabbit masks to help bring in a bit of money, although to say that she’s obsessed with rabbits would be an understatement. She claims it’s because “the rabbits will someday reach the moon.”

When Gosuke founds his new dojo, he decides to create a style of swordsmanship known as “Rabbit Style Fencing.”

Mugen is a rough-around-the-edges mercenary with a killer technique and nothing left to lose. Jin is a disciplined samurai who’s as deadly as he is reserved. Fuu is a young waitress with a good heart and a resourcefulness that emerges when you least expect it. These three unlikely companions are about to begin a journey that will change all of their lives. It’s a dangerous quest for a mysterious samurai that will see our squabbling group of heroes get into and out of trouble more times than they can count (which admittedly, isn’t very high). From the cynical gentility of the nobles to the backstabbing of the Japanese underworld, Mugen, Jin and Fuu will face threats from without and within as they hurl insults and throwing stars alike. Ancient Japan is about to get a lethal dose of street justice—Champloo style. And it will never be the same.

Tokugawa Iemitsu struggles with his fear of death and finds salvation in the young samurai Samon of the Yagyuu clan. But their relationship triggers a battle for power and respect, stirring tension between the Shogun and the Yagyuu clan.