Volume 1 of the Demons of Onigashima side story. "A dance of a thousand cherry blossoms. The Ronin of a Hundred Demons dances as a god of flame as a thousand cherry blossoms burn around him. He who commands many demons shall also command the fate of Japan." The heat of summer.. a time for vacations. And even heroes need vacations.. even if an organization called GREMLIN is currently the world, they work slow.. and Ben and Mikoto need down time. Grandpa Max decides it's high time for another traditional Tennyson Family Summer Vacation, in other words, running on a country tour in an old junky RV called the Rust Bucket. However, this time it's not an exploration of the States, but of Japan. Little do Ben, Kuroko, Mikoto and Max know however.. that they're about to get more of Japan than they bargained for.. The gods of Japan are fickle, and the monsters and demons of Onigashima are hungry. Demons and Aliens clash. Toaru Kagaku no Omnituriksu the Demons of Onigashima, is about to begin.

Tokiwadai Middle School. The most prestigious all girls school in the world. Nestled in the School Garden district of Academy City, where the most powerful espers attend the most high class schools, it is every boy's dream to somehow sneak a peek at the girls who attend. That.. is not Ben's wish. He already has a girlfriend who attends that school after all. But it's not like he has a choice in the matter. After much debate, Tokiwadai decides to pick a random boy from A Certain High School to attend Tokiwadai twice a week as part of an experimental program, and Ben is selected. Can Ben's aliens save him from a hodge podge of Mikoto Misaka's classmates? Can he survive the wrath of Kuroko Shirai? Will he EVER find the Golden Sumo Slammer card? WHY DOES EVERYONE WANT TO AMBUSH HIM WITH FAN SERVICE!? All the answers are here, in the Tokiwadai Side Series!!!

Index has been kidnapped by Fiamma of The Right to initiate his plan "Heaven on Earth" a plan conducted in partnership with the High Breed to penetrate Aleister Crowley's defenses and raze the Earth clean of life. Meanwhile, the Highbreed begin their attack on countless worlds, determined to commit complete 100 percent Genocide on the entire Universe. All that's left to fight them, is Ben Tennyson and his friends... All the fights end here.. the fate for the entire Earth hangs on these heroes' shoulders.

A mysterious explosion has ignited in the Eurotunnel in Britain. So far, the thoughts are that France bombed the tunnel as part of their retaliation during World War 3. However, Necessarius believes differently, and has called in Index to investigate. Meanwhile, Ben, Mikoto, and company, have spent the better part of the entire year battling on the side of Academy City in various warzones, Ben further questioning all the while whether the side he picked is the right one. So far, the only reason for the war not breaking out into something worse is due to Russians fearing the power of Ben's current most powerful form: Atomix. However, Ben and Mikoto are called by Necessarius to accompany Index and Touma as an extra security measure to investigate the Eurotunnel Bombing. And along the way, Ben meets the 3 Princesses of the British Royal Family, Rimea, Villian and Carissa. Villian is currently being backed by Necessarius for the throne.. however, Carissa is intent to gain her royal birthright.. by any means necessary.

It's the 3rd day of the Daihaseisai, and Mikoto and Ben finally have established themselves as a dating couple. However, Ben wants this relationship to be special.. he wants to do something that will guarantee a lasting relationship with Mikoto. Ben's luck pays off when for once in Touma's life.. HIS luck actually pays off. Touma wins 4 tickets to Venice, Italy. A seaside city of romance.. and with his generosity, Touma invites Ben and Mikoto to come along with him and Index. However, romance isn't cheap.. sometimes there are unforetold detours.. like a certain magical organization that is preparing itself for war! Can the super powered alien forms of Ben 10 match up against the forces of the God's Right Seat? Or is this vacation going to be the last vacation Ben and his friends ever take?

(Chronology: Daihaseisai Arc of A Certain Magical Index.) The Daihaseisai is here! A festival event where all the schools in Academy City compete with each other in sporting events.. a festival even more popular then the World Cup. Espers from all over are encouraged to use their abilities. Meanwhile, the Board of Directors have taken an interest in Ben Tennyson after his success in defeating the Eigth Level 5 Impulser.. the Level 5 whose power was impossible to categorize.. and Aleister Crowley, the City administrator has taken up a rather sinister plan to find out how to test this new weapon in his arsenal... attract the most powerful conquerer in the Galaxy to do battle with that boy. Meanwhile, Ben is starting to realize the possibility that he might have feelings for Mikoto, but is scared of what it might mean... And while Mikoto feels the same way, she doesn't know what to do with those feelings.. But of course.. all things must eventually converge and resolve, for better or for worse.

An Invasion of Academy City has begun. The Catholic Church has sent one of it's most powerful magicians Vento of The Front, in order to begin an invasion of Academy City by the Magic Side. However, Aleister doesn't plan to let his foes take him down easily. Meanwhile, the world's most powerful Esper, Accelerator finds himself fighting his own battle. Ben Tennyson finds himself caught in the middle of these two vicious battles by a strange circumstance, unwittingly dragging Albedo into the situation as well. This collision of Academy City's greatest powerhouses and the Magic Side's intent for control, is bound to cause mass mayhem.. the Invasion of Academy City has begun!!

A 3rd world war seems to be looming on the horizon as somehow, the world all seems to be turning against Academy City thanks to the influence of the Roman Catholic Church. Touma Kamijou and Index are both sent to Avignon, France in order to help destroy an artifact being used by the Catholic Church to turn the world against the Science Side and cause war. However, they disappear soon upon arrival.. and Ben and Mikoto step in to search for them. Things get more difficult however when Vilgax makes a surprise visit to France.. and Ben finds himself facing another member of God's Right Seat, Terra of The Left, while Mikoto is left to fend against the mysterious Malware, a being born of Tree Diagram and the DNA of Upgrade. The world seems to be turning further upside-down as the occult, science, and what lies beyond our planet get mixed in a titanic showdown.

After the defeats of Terra of the Left and Vento of The Front by Ben Tennyson, Acqua of the Back sends out a warning that he intends to destroy the Omnitrix and the one wielding it. In response, The Church of England sends the Amakusa Church to provide protection while the Plumbers send in forces of their own. But can anyone protect Ben from a Saint Class magician powerful enough to even defeat the Ultimate Aliens with ease?

It's Back to Bellwood for Ben. When Winter Break comes around the corner, Mikoto is excited to come back to Ben's home town to spend Christmas with the Tennysons. A nice quiet city, where nobody's trying to experiment with you. Though granted, the tendency for aliens to turn up is rather overly usual. However, Mikoto isn't the only one from Academy City who comes to Bellwood. All 10 Level 5s are here too, each of them for their own reasons, and tensions are running high between them and the Highbreed who have also turned up in the vicinity, leading to an all out Battle Royale between Aliens and Espers. The Battle Royale Arc has begun