FUKUOKA (Kyodo) Health food maker Kyusai Co. said Monday it has agreed to a public tender offer for its shares by investment fund Green Partners B.

Tokyo-based Green Partners B will acquire a 64 percent stake held by Kyusai's founder, Tsuneo Hasegawa, and his family, and will seek to purchase all of the remaining shares. The total investment cost would amount to as much as 63 billion yen.

The tender offer will be open from Friday to Nov. 9 at a price of 1,920 yen per share, Fukuoka-based Kyusai said.