Accel World vs. Sword Art Online is an action role-playing video game developed by Artdink and published by Bandai Namco Entertainment for the PlayStation 4, PlayStation Vita, and Microsoft Windows. It is based on the Accel World and Sword Art Online light novel series. The story begins with Asuna and Kirito from Sword Art Online being on a picnic with Yui, looking for a spot. Suddenly, they were attacked by the monsters despite the location being a neutral one. After that, an alarm starts alerting everyone to log out at once or be punished. Yui warns Asuna and Kirito to leave before running away, but they follow her to a shrine instead. Kirito is there attacked by Accel World's Black Lotus, who was hired by a witch named Persona Vabel as a diversion while she managed to seal away Yui in plans to start an apocalypse. Realizing she was tricked by the witch, Black Lotus decides to help Kirito and Asuna. Because Persona Vabel is powerful, the trio retreats. They concluded that since they have ignored the logout warning, some of their friends must have as well. The goal is to recruit those, while figuring out why are their worlds colliding, and what Persona Vabel's plans are.