Aeon Corp., Japan's largest supermarket chain, said Monday it is seeking investor support to block a ¥15 billion takeover of drugstore chain CFS Corp.

Aeon, which owns a 15 percent stake in CFS, will ask other investors to vote against Ain Pharmaciez Inc.'s acquisition of CFS at a shareholders' meeting Jan. 22, Aeon said. Aeon needs the support of another 18 percent of voting rights to veto the takeover.

CFS last week rejected a proposal to form an alliance with two of Aeon's affiliates.