Although the man wore a school uniform that Kirito had no memories of, he recognised the man as being the mysterious character who had taken the role of the giant Beli in a quest in ALO.Īfter Tatsuya explained that they were inside a virtual simulation, he decided to tell Kirito his real name and then considered whether he should take the same measures to deal with his own world connecting with Kirito's. Kirito was about to draw his sword when he realised that he had already met with the person before. Just as Kirito voiced his complaint about the situation, he heard another person responding to him. Although Kirito had asked to use a default avatar, he found that he looked exactly like his avatar in ALfheim Online. Kirito found himself inside a pure white sphere, instead of a forest where he should have appeared. Kazuto ended his thoughts with the conclusion that he could not verify this, as such an event was unlikely to occur again. While waiting for the test to begin, Kazuto recalled how he had encountered Silver Crow during the previous test and thought how the event could have been caused by the STL using quantum registers in parallel worlds, resulting in the two quantum devices interfering with each other. Takeru then changed the topic, as he wanted to begin the test. Takeru claimed that it could not, but admitted that he had tried tried improving the STL to win the prize for deciphering an RSA encryption until his actions were discovered by Kikuoka Seijirou and he was scolded for it. After Kazuto calmed down, he asked Takeru whether the STL was capable of decomposing very large numbers into prime numbers. Later that day, Kazuto came to his part-time job in Roppongi and complained to Higa Takeru about Suguha not comprehending his explanation. However, to Kazuto's dismay, after he finished his explanation, Suguha bluntly stated that she did not understand the explanation. Finally, he explained how a quantum computer would be superior to a Neumann computer, as it could process multiple tasks simultaneously via superposition. He then explained what a Neumann computer was and stated that such computers had difficulty in decomposing large numbers into prime numbers. Kazuto first explained the difference between quanta and elementary particles by using rice grains and their energy value as an analogy. Although Kazuto was hesitant, once Suguha apologised for her question by saying that there were things that Kazuto did not know either, Kazuto agreed to give her a rough explanation. This story is set several days after the events of the first part of the crossover and features Kirigaya Kazuto (Kirito), the protagonist of the Sword Art Online series, crossing over to The irregular at magic high school universe while testing the Soul Translator (STL) for Rath, which results in a brief reunion with Shiba Tatsuya, the protagonist of The irregular at magic high school series.Ī week after the encounter with Silver Crow during a test with the Soul Translator, and several days after encountering Shiba Tatsuya in ALfheim Online, Kirigaya Kazuto was having breakfast with Kirigaya Suguha, when she asked him to explain what a quantum computer was. It is also a spiritual sequel to Versus, the crossover story between Sword Art Online and Accel World. Versus II serves as an epilogue to Dream Game -Crossover-, the first part of the crossover between Sword Art Online and The irregular at magic high school. It was released on Octoas part of Dengeki Bunko MAGAZINE Vol.40. The second part of the crossover is written by Kawahara Reki, the author of Sword Art Online, and supervised by Satou Tsutomu, the author of The irregular at magic high school. Versus II ( バーサス II, Bāsasu II ?) is a magazine bonus side story and the second and final part of a two-part crossover between the Sword Art Online and The irregular at magic high school (Mahouka Koukou no Rettousei) series.