Onamba, a components maker listed on the Tokyo Stock Exchange's Standard market, disclosed on August 18 that it has been sued by Kaneka in the Osaka District Court over a defect in lead-in cables that the chemicals maker says forced a recall covering some of its residential solar power systems. Kaneka filed the complaint on July 14, 2026, and Onamba received the statement of claim on August 18. The requested damages: ¥3.63bn, or more precisely ¥3,629,413,997.
The dispute traces back to a recall Kaneka began on September 6, 2024, covering lead-in cables used in some of its residential solar power generation systems. Kaneka alleges the recall was caused by a defect in specific products Onamba supplied and is seeking compensation for the costs the recall has generated.
The number on the complaint is not the ceiling. Kaneka told the court that the ¥3.63bn figure reflects costs incurred only up to the end of March 2026, and stated that recall expenses are expected to increase substantially as the recall progresses. For a supplier whose exposure is tied to an open-ended consumer recall rather than a fixed defect event, that is the detail that matters more than the headline figure: the claim is a snapshot, not a final bill.
Onamba's own account, filed separately with the Tokyo Stock Exchange, is notably thin on defense. The company said it will examine the contents of the complaint and respond appropriately, and that it is currently difficult to forecast the impact on its earnings. No timeline for a response or a hearing date appears in either filing.
For now the case sits at the stage of a served complaint, not a judgment, and the ¥3.63bn figure is Kaneka's opening claim rather than a court-tested liability. Onamba has committed to disclose further developments as they occur.