Loosely based on the novel Romance of the Three Kingdoms, modern day Japan sees a similar struggle for power between different rival schools with the three strongest being; Kyosho Academy led by Sousou Moutoku, Nanyo Academy by Sonsaku Hakufu and Ryuubi Gentoku from Seito High School. Together these three tousei, each with their own mangatama, fight for the honor of becoming ikkitousen and fulfilling their fated destiny through battle and conquest. (Source: ANN)

In Ikkitousen, the Kanto region of Japan is locked in the middle of a turf war between seven different high schools. Among the students of these schools are a select few who are in possession of sacred beads. These magatama harbor the souls of warriors who fought during the Three Kingdoms Era of Chinese history. Not only are these students blessed with abilities that draw from the souls they are tied to, but they are also blessed, or maybe cursed, with the fates of these warriors from the past. One of these students is Hakufu Sonsaku; a young, caring, dim-witted girl who has recently transferred into Nanyo Academy and will be living with her cousin, Koukin Shuyu. Hakufu’s arrival creates an almost immediate sense of tension due to her power as a fighter and the possibility that she may be the one who carries the spirit of the Chinese warlord, Sun Ce. The most powerful fighters at Nanyo, known as “The Big Four” are shaken by her presence and determined to stop Hakufu from achieving the goal given to her by her mother: to conquer those who challenge her and unite the seven schools.

As the head of her middle school's science club, it's only fitting that Ueno is also a brilliant inventor. With devices that can convert any liquid into drinkable water, deodorize the most foul smells, or even generate dark matter to be used as a means of concealment, it seems like nothing is beyond Ueno's capabilities. However, she doesn't invent these devices for the advancement of mankind. Rather, the one force that motivates her is love, the only phenomenon she can't quite figure out. Ueno is head over heels for Tanaka, her nonchalant fellow club member. Yet, because she is too nervous to confess her love and he is too oblivious to notice her affection, her love life is completely stagnant. In Ueno's mind, if she could just expose him to perverted situations, then surely he'd get flustered and fall for her, right? Assisted by her stone-faced classmate and dedicated wingwoman Yamashita, Ueno employs her many inventions on Tanaka in a lewd manner in hopes that he may one day understand how she feels. [Written by MAL Rewrite]

For some people, high school represents the opportunity for a fresh start. You can take new classes and make new friends. For Souichiro Nagi and Bob Makihara, though, high school means something different: the chance to become the top fighters in the entire student body! Too bad Toudou Academy is the hardest possible place to realize their dreams. Their new high school is no ordinary academic institution. Rather than concentrating on classic subjects like math and science, Toudou Academy was created for the sole purpose of reviving the martial arts in Japan! As a result, Souichiro's aspirations to become top dog are cut short when he runs afoul of Masataka Takayanagi and Maya Natsume. The two upperclassmen easily stop the freshmen duo's rampage across school, but rather than serving as a deterrent, it only stokes their competitive fire. What kind of monstrous fighters attend Toudou Academy? Are there any stronger than Masataka and Maya? And why in the world is Maya's younger sister stalking Souichiro? Learn the answers to these questions and more in Tenjou Tenge!