Girlfriend Note
Girl Friend (♪) is a 3D rhythm game that is released at December 1st, 2015. It's a mobile rhythm game similar to Love Live: School Idol Festival and the Idolm@ster rhythm games, and will be playable on Android and iOS. You can find the official site for the game here.
Gameplay
Based on what we know so far, the game seems to be similar to other mobile rhythm games like Love Live and Idolm@ster. For the actual rhythm game aspect of it, hearts will appear on screen and you'll have to touch them when an overlapping heart covers it entirely. The overlapping hearts will travel from the center of the screen outwards, just like in Love Live. There will also be hold notes and double notes.
At the end of every song, you will be given a score and a rank. Details on how scoring and ranking works is currently unknown.
The game will most likely be card-based just like other mobile rhythm games similar to Love Live, with each card having a "skill" or "cheer." This skill can be activated during gameplay, and will result in the girl's image "cutting in" to gameplay, as can be seen in the gameplay video. These will generally provide score bonuses or other helpful effects.
The choreography and modeling is all done in 3DCG.
Anyone who has more information on the game, please feel free to update this article!
Updates
On August 15th, 2015, a YouTube video featuring the game was released. You can find the video here.
On September 23rd, 2015, a live broadcast featuring the game was shown on NicoNicoLive. The link to view the timeshift can be found here. For those that would like to view a quick video that shows how the gameplay works, feel free to to check this short video out. Beware - it's very low quality!
On December 1st, the game is now available for download on Android and iOS.