Photo/IllutrationShiori Yamao, a member of the Democratic Party in the Lower House (Asahi Shimbun file photo)

Former prosecutor Shiori Yamao will be appointed by the new leader of the main opposition Democratic Party to the post of secretary-general, the party's No. 2 slot, sources said Sept. 2.

The selection follows the victory of Seiji Maehara, former foreign minister, over Yukio Edano, former chief Cabinet secretary, in the presidential election the previous day.

Yamao, 43, was elected for the first time to the Lower House on the Democratic Party of Japan ticket, the predecessor of the Democratic Party, in 2009, when the DPJ wrested power from the Liberal Democratic Party. She represents a constituency in Aichi Prefecture.

Yamao is known for taking Prime Minister Shinzo Abe to task in Diet sessions for failing to address the nation's serious shortage of nursery schools, an issue that drew widespread attention following a mother’s online protest earlier last year.

Maehara, 55, is also expected to appoint Edano, 53, to the post of deputy president in an attempt to unify the party and turn around the party’s sagging political fortunes before the Lower House election, which must be held by the end of next year.

Former health minister Akira Nagatsuma, a supporter of Edano in the presidential election, has apparently been tapped to chair the party's election campaign committee.