How do I uninstall the LINE app (third party app)?

At my sister's suggestion, I installed the [LINE](https://play.google.com/store/apps/details?id=jp.naver.line.android) app in my Galaxy S3. After a while I decided I didn't like it, so I want to uninstall it. Weirdly, when I open Settings > Application manager, there is no option to remove application, only "Uninstall update", which restore an earlier version of the app. The same situation when I open Google Play, the "Uninstall" button only uninstall the updates and restore an earlier version. Same luck with trying [an uninstaller ](https://play.google.com/store/apps/details?id=mobi.infolife.uninstaller&hl=en) . I also read that some application may [prevent uninstallation](https://android.stackexchange.com/questions/42427/how-do-i-remove-an-app-installed-if-the-buttons-in-manage-applications-are-loc/42438) by setting itself as Device Administrator, but I check my Device Administrators and LINE isn't listed. I only observed this behaviour before for system apps or apps that got installed by my carrier, but LINE certainly isn't such app, I installed it myself. How could they have uninstall restriction, and how can I uninstall it?