Service
Non-consumable subject unlocks for Denken EX First Class Primary (jp.denkenex.first.primary). The catalog has 19 products: four individual subjects, 14 remaining-subject combinations and one all-subject set. The app displays eligible offers based on verified ownership.
Prices
Japan (tax included): individual subject JPY 500; remaining 1/2/3 subjects JPY 450/900/1,350; all four JPY 1,800. All subjects for 2026 and 2025 are free; earlier years require purchase. International prices are converted by Apple. The price shown in the app/App Store at purchase is final. A remaining-subject price covers only this purchase, excluding prior payments.
Payment and additional costs
App Store payment methods designated by Apple apply. Your Apple Account is charged on purchase completion, with billing timing governed by Apple. You pay connectivity costs; no shipping fees.
Delivery and recurring charges
Access is normally provided immediately after successful payment and StoreKit verification; pending transactions require confirmation. These are one-time purchases, not subscriptions.
Returns and refunds
Due to the nature of digital content, convenience returns/cancellations are not accepted, except where permitted by law or Apple’s refund policy. Request refunds through Apple.
Scope and requirements
Rights apply only to the purchased subjects in this app, separately from other Denken EX apps. Restore with the same Apple Account. See the App Store listing for supported OS and devices.
Operator and seller disclosure
Operated by TKLab. The seller’s legal name, address and telephone number will be disclosed without delay by email or similar means on request. You may request this information before deciding to purchase.
Disclosure requests and support
tklab.support.contact@gmail.com — subject: Request for seller disclosure under Japan’s Specified Commercial Transactions Act.