This download is totally safe. MocoGame is the developer of the app which is listed among the Casino Games category. ノルマ麻雀 was downloaded and installed by over 5K users and its latest stable release was on Oct 14, 2020.
The game is for users aged 14 and older, it has been rated 2.4 on Google Play. There are advertisements in this application. It's free to get the installation package of ノルマ麻雀, also, you can check out users' reviews on Droid Informer. The app works fine on Android 4.0 and above.