Answer
According to the Google Play listing (as of 3 September 2026), there is a one-off purchase for the full game, no subscription and no further in-app purchases. OshiYa is offered without ad tracking.
The store, product page and app show the same purchase model. If expansions are added later, it will be clear before you buy whether they are included in the full price, cost a one-off fee or are charged on a recurring basis.
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As of 3 September 2026
Further reading
Related topic: OshiYa