According to Japan Times, Kodansha has lodged a protest against Amazon Japan after the online retailer removed more than 1,000 titles from its famous e-book subscription service, Kindle Unlimited.

Kindle Unlimited has been added recently in the Japanese Amazon website, August 3. The service allows users that have subscribed to Amazon’s monthly subscription program to borrow titles from their online library for free. Kindle unlimited offers 120,000 Japanese titles and more that a million foreign.

Kodansha is not the only retailer to see their titles being deleted, as Japanese publisher Kobunsha also claimed that Amazon removed 550 of its titles from the service.

According to the source, Amazon Japan said it cannot comment on specific business deals.