In 1966, they introduced "Ultra-kaiju" PVC figures. These tough toys won children's hearts and were very successful in business. In 1967 Marusan changed their name to "Maruzan Co., Ltd."(K.K.マルザン). New logo was "san", not "zan", in a red circle. Although the reason for change of the name was for wishing development of the company, Maruzan was unexpectedly bankrupted in 1968.
