TOKYO, 20 JULY - Last day of election campaign in Japan, before Sunday's vote for the renewal of about half of the 245 seats in the upper house of Parliament. According to the Japanese electoral law, 74 members will be elected in the prefectural constituencies, while the remaining 50 will get the seat with a proportional system on a national basis. Prime Minister Shinzo Abe, head of the governing coalition - formed by the liberal-democratic party and the center-right Buddhist-inspired force, Komeito, aims to extend the majority to the Senate by prevailing over the main opposition forces, which see in the front row the Japan's constitutional democratic party, led by former cabinet chief Yukio Edano in the government of Naoto Kan. The reform of the pacifist Constitution wanted by Abe, the sustainability of the pension system, and the viability of the VAT increase, approved by the government starting from October, and excluded from the other parties