僕のヤミカワ彼女 is an Android simulation game developed by MASK LLC. It falls under the category of games and specifically belongs to the subcategory of simulation. The game revolves around the troubles faced by the characters, with a focus on four main aspects: gaining weight, wanting to become cuter, desiring a change in personality, and wanting to do something for their boyfriend.

The gameplay involves observing the characters in their "BEFORE" state and then tapping to transform them into "AFTER" versions. By reading carefully and tapping the appropriate options in the transformation reason text, players can uncover the truth behind the drastic changes.

Please note that for YouTube and other platforms where the game is being live-streamed, it is requested to set the rating according to the app's rating. It is important to mention that the game may contain some expressions that could be considered discomforting.