The upheaval in the opposition camp shows no sign of letting up, as witnessed by the Wednesday sacking of Kenji Eda as secretary-general of the 36 Diet member Your Party, a move that may divide its ranks.
Amid the opposition disarray, the Liberal Democratic Party-New Komeito ruling bloc has gained momentum supported by Prime Minister Shinzo Abe's high approval ratings.
This time last year the LDP was the main opposition force and the Democratic Party of Japan was in power. But Abe's long-ruling LDP roared back to power in the December Lower House election, and the ruling bloc further solidified its gains by its huge win in the July 21 Upper House poll, leaving the opposition camp in tatters.