The game opens on September 11, 2018. When Hayato is about to test his "Dragon Unit" flight pack on the school's roof, a girl falls from the sky, wearing a similar device. He tries to save her, but falls to his death; after this, he is transported back in time without any memory of the event, and manages to save her. Her name turns out to be Arika Tokitou. Ryuusei Academy and the Second Science Club prepare for a school festival that is scheduled for a month later, when Hayato's science professor, Genkuro Kanbara, gives him a smartphone chip composed of an "Agastia Stone", which theoretically would allow him to receive voice messages from the future. He installs it and does receive messages from the future, but is unable to tell what they are saying.
At one point, due to an accident with the Dragon Unit, Hayato's house blows up, forcing him to sleep in the science clubroom. He and the rest of the club decide that for the festival, they should put on a live performance for...
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