A forecast of single-seat constituency is as follows. I refered to speculation or privious results at every block.
+------------------+
| LDP 130 |
| DPJ 150 |
| Komei 5 |
| JCP 0 |
| SDP 2 |
| Nippon 1 |
| Kokumin 2 |
| nonpartisan 10 |
--------------------
| Total 300 |
+------------------+
A forecast of proportional consistency is as follows. I refered to the question "What party will you poll in proportional consistency of the next election?" in the public opinion poll by the press (FNN, JNN, NNN and Nikkei).
Considering the statistical standard error 5 percent, the total is as follows.
+-------------------------+
| LDP 180 -- 198 |
| DPJ 233 -- 257 |
| Komei 14 -- 16 |
| JCP 9 -- 9 |
| SDP 7 -- 7 |
| Nippon 1 -- 1 |
| Kokumin 4 -- 4 |
| nonpartisan 9 -- 11 |
+-------------------------+