The game has been updated with a new revamped system, modes, music rhythm, etc.
Are you looking for another good fully voiced idol rhythm and simulation type of game with cute Anime characters next to Love Live School Idol Festival? Then you've landed on the right page! Apparently a lot of people have been hyping up the release of this game and now that it is finally out, they can go crazy. The official English wiki for Tokyo 7th Sisters description is below.
In the year 2032, the legendary idol unit "7th Sisters" suddenly retired from the industry and disappeared. That was the end of the idol industry... until two years later, when a young glory-seeking girl is appointed to be the leader of Tokyo's next generation idol studio, "777 (Three Seven)", commonly referred to as Nanasuta. However, the city continues to believe that idols are a thing of the past, and Nanasuta is no exception. Their slump continues, but one day a mysterious and beautiful female manager approaches you and says, "If the idols of the past are gone, we'll just have to make new idols! True "sisters" linked by powerful bonds!" The story of the idols of the future, the Nanasuta Sisters, will now unfold.