Before You Buy
Grand Gourmet is a paid game, so the check that matters happens before payment, not after. On the Google Play listing, confirm the publisher is Bandai Namco Entertainment, the price is $12.99, and the game is the restaurant management sim with the Straw Hat Crew at the Baratie. If those three facts match, you are on the official listing. This site reviews every game it covers on real phones, and you can read exactly how that testing works on the how we review restaurant games page.
Buy on a connection you trust, on the Google account that owns your Android library, and on the phone or tablet you will actually play on. Google Play then owns the install and the updates, which means a fresh install later is a store download, not a hunt for a file.
Installing After Purchase
After the purchase, Google Play installs the game the way it installs any store app. Open it, let the opening service teach you the kitchen and the dining room, and follow the first dishes the crew suggests. Your first week should be simple: one new recipe at a time, one design change at a time, and one regular learned at a time.
If the install stalls, check storage first, then restart Google Play, then restart the phone. A store install that stalls is almost always storage or a stuck store session, and both clear with those two steps.
Why Official Only
A paid game offered free as a file cannot be the official version, and it cannot be verified the way a store listing can. Files from unofficial sources can be modified, out of date, or bundled with something you did not ask for. The official listing gives you the real publisher, the real price, the real rating, and updates from the store. That is why this site links only to Google Play, and why it will never link to a hosted game file.