A guideline of the Ministry of Economy, Trade and Industry for the casting and forging industry, last revised in April 2019, describes a case under the Subcontract Act. A buyer obtains a price cut from a supplier on the promise that it is only temporary. When conditions recover and the supplier asks to discuss the price, the buyer keeps it down on its own, without enough consultation.
The guideline treats this as kaitataki, beating down the price.