From the series ElectroMania:
100 years in the future, a towering metropolis called New City pulses with electricity. Toshio Watanabe, a socially anxious shut-in, lives here. One night Toshio chases down two kidnappers, rescuing their victim- a person named Lei. When Lei returns consciousness with amnesia, Toshio vows to help them find a way back home. But he could end up venturing deeper into New City- and Lei's true history- than he ever believed possible.