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Yūko Onebō was a client of both Gregory Edgeworth and Phoenix Wright. She was accused of killing Kōta Kitamita in both 2001 and 2016.
The "time traveler"[]
Onebō was an engineering student at Ivy University in 2001 who one day encountered the mysterious Kōta Kitamita. Kitamita claimed to be time traveler from 2016 who had come back in time to 2001 after fleeing from a criminal who killed his wife. He asked for Onebō's aide in repairing his time machine to get back to the year 2016.
After Onebō had been working at Kitamita's lab for several months, Kitamita was assaulted and Onebō fell unconscious. When she awoke, she discovered that Kitamita was dead and that the room was locked from the inside; she was swiftly arrested by the police, who were waiting outside. Defense attorney Gregory Edgeworth subsequently took on Onebō's defense and, despite the corrupt efforts of Prosecutor Manfred von Karma, Edgeworth successfully defended Onebō. However, the trial was suddenly put on hold after she disappeared, only to finally reappear fifteen years later in 2016; appearing at the Wright & Co. Law Offices, she claimed to have leapt through time.