The failed department store chain Sogo Co. filed a lawsuit Wednesday against three of its former executives for damages, citing fictitious deals with a subsidiary prior to the firm's collapse in June.

Current Sogo management filed the suit with the Tokyo District Court against former Chairman Hiroo Mizushima, 88, former Vice Chairman Moriichi Inoue, 87, and former Vice President Yukio Nakazawa, 74, demanding the three repay the firm some 2.69 billion yen.

The plaintiff said the three former executives are responsible for the money that has not been paid back by Cho-ompa, a subsidiary of Sogo.