Keidai Saeki is a high school student who remembers his past life in Pompeii, living as the Italian warrior Sirix. His friends around him are all also reincarnated - although they don't quite remember things the way he does. And Keidai's wife from the past? She's now a middle school boy - while his best male friend is now a cute girl?!

Talk about life getting into a hotspot! Keidai Saeki's life is pretty confusing, what with his past life's friends and family being reincarnated in wrong bodies and all. And now it's about to get downright crazy! Another former Pompeiian joins the party, and, just like Keidai, he also retains the memories of a past life! It's unfortunate for our hero that this relationship didn't stay dormant. They didn't really get along 1,900 years ago, and someone's held a grudge...

Keidai's feelings and memories of his past in Pompeii are tested yet again when a beautiful girl appears who is an identical clone of Serena! And when she plays along that she's his "ex-girlfriend," Yuuma and Serizawa are thrown into a tizzy, too. Has their past-life/present-life love triangle suddenly become a quadrangle?!

New girl Reina transfers to his school - and she looks exactly like Serena, Kedai's past-life wife, the same wife currently reincarnated in the form of his male-best friend Yuuma. Will Reina's flirtation with Kedai spark Yuuma's memory of his past-life love? Mii continues to struggle with her present-day feelings for Kedai, and her past-life impulse to see Kedai and Yuuma together again as Sirix and Serena.

In the future, the world is full of 'Legions,' or robots that serve to fulfill the needs of humans. Nanami, a fresh young graduate from the technician academy, is assigned to the 7th precinct as the repair technician for the Legion Officers. Or so he thinks... Soon after, a female Legion officer tells Nanami that he's the new head chief for the 7th precinct. Unfortunately, the pieces of concrete that were thrown at him earlier are all that remains of it!

Miharu Rokujo was content to live life without caring about anything, but unfortunately, his destiny had other plans. The secret art known as Shinra Banshou, with the power to control the entire world, is hidden inside him, and every ninja is involved in the fight over it. Against his will, Miharu is made to join his school's Nindo Club, a club that teaches the way of the ninja, in order to protect himself.

As the besieged Fuuma village recovers from the Grey Wolves' attack, its leader suggests Miharu and company adopt the objective of those who laid waste to his village: stealing the forbidden arts of other ninja clans. Shocked, the ninja of Banten are left to wonder just how far will not only Miharu's enemies, but also his allies, go to possess the Shinra Banshou... and at what cost?

The Hidden World seems less and less hidden as Togakushi Village approaches the ninjas of Banten with a proposition: in return for their help in taking out an eminent scientist-turned-weapons developer in the surface world, Togakushi will hand over their forbidden art scroll. But this job offer comes with strings attached as Togakushi's mind-reading chief holds Banten's deepest, darkest secrets hostage and threatens to reveal all if they refuse to play nice! Will Kumohira-sensei's decidedly peace-loving way of the ninja allow him to cover his hands in blood?!

While investigating a strange space anomaly, the Space Battleship Nadesico encounters a long-lost interstellar cruiser that mysteriously vanished many years ago. What bizarre connection binds these two ships? But first, it's the forces of Earth versus the alien armada of Jupiter... with the Nadesico in the middle!

The beautiful Yurika, former captain of the Nadesico, has been spirited away to become the shaman queen of the sacred Yamato clan. Meanwhile, on the Nadesico space ship, the young girl genius Ruri Hoshino and the cute robot 99 guide their ship into battle following against the Jupiterian menace, but suddenly the Federation ships begin to retreat.