Shown at the Tokyo Motor Show in October–November 1971, the SV-1 was the prototype for the Celica Liftback released in April 1973.
Yep, it's the Toyota SV-1, a prototype shown at the Tokyo motorshow in 1971 that would later become the RA25 Celica Liftback. There are some subtle changes between it and the Celica, but it's very similar. I should also note that the SV-1 is based on the TA22 coupe, and uses a 2T-G, whereas the production car had an 18R-G.