Maimai
From Sega Retro
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maimai is an arcade rhythm game by Sega. In the game, you are presented with a circular touchscreen with buttons around the screen. The goal is to tap the buttons and drag your finger across the screen on beat.
In Japan, the game has a camera which can record videos of players playing the game, projecting them onto the game screen, and uploading the resultant videos onto Nico Nico Douga.
It has so far only been released in Japan and some Asian countries (in English); whether or not it will see an international release is unclear. An update called maimaiPLUS was also released in Japan.