REUNION" is a bar in another dimension that connects to every era. Mika is a female cyborg who works there. Her lower body is an ugly tin-work machine. Mica has lost her memories of the past, but she still works there, always with a smile on her face. Every night, men and women from all walks of life come through the store's door "GATE" and enjoy talking with Mika. One day, M-chin, a man who has a clue to Mika's lost memories, visits the store. Mica is helped by the regulars and sets off on a journey into the "lost past".