The game referred to in this search string is a mature, anime-inspired monster-collection role-playing game. Heavily parodying classic handheld monster-catcher mechanics, it replaces traditional pocket monsters with uniquely designed monster girls.

It's important to note that the game is not listed for mobile platforms (Android, iOS) on its primary store pages, but the user's search for an APK suggests either a version exists or they are looking for a way to play it on a mobile device.

Use a mobile file manager (like ZArchiver) to extract the game folder onto your phone's storage.