From the perspective of intellectual property rights, if the toys produced by this Japanese company infringe on China's patents, then selling them in China is an infringement.
From the perspective of agency rights, if you Japanese manufacturers directly purchase goods for domestic sales. If the Japanese manufacturer has authorized a Chinese company as the only agent in mainland China, you should not be able to purchase goods directly from the manufacturer. Otherwise, the Japanese manufacturer will breach the contract with the domestic agent. But because it does not Be clear about the agreement between the Japanese manufacturer and the agent. You can absolutely request the purchase of goods. Whether or not the Japanese manufacturer breaches the contract is a matter for the Japanese manufacturer and has nothing to do with you, unless you know it and still ask for it.