Japan's main opposition Constitutional Democratic Party of Japan will cooperate with other opposition forces to jointly secure more than half of the contested House of Councillors seats in the election in summer, the party's leader said Sunday.In the upcoming election for the 248-seat upper house, held every three years as the six-year term for half of its members expires, 125 seats will be contested.Of those seats, 75 will be chosen in specific districts and 50 through proportional representation, including one of the seats in the Kanagawa district vacated in 2021."The election headquarter…READ FULL ARTICLE