Japanese publisher Kodansha lodged a protest with online retailer Amazon Japan on Monday after Amazon removed more than 1,000 Kodansha titles from its Kindle Unlimited e-book subscription service.
Japanese publisher Kobunsha also claimed on Monday that Amazon removed 550 of its titles from the service.
Amazon Japan launched the service in Japan on August 3.
The Japan Times additionally cited a publishing industry source that stated Amazon told the publishers its budget ran out after some titles saw demand beyond what Amazon expected.