Pop N Music/YMMV

Tropes

 * Periphery Demographic -- According to That Other Wiki, pop'n was originally intended to be played by couples on dates.
 * "Stop Having Fun!" Guys -- Some higher-end players will berate you if you don't use Cho-Challenge mode.
 * Surprise Difficulty -- Not convinced that a cute and cheerful game can be Nintendo Hard? 3 y Vp P Jvss]] Here you go.]]Well, there's a reason why on Wikipedia, the article states that pop'n music has some of the hardest songs in any rhythm game.
 * Tear Jerker -- A song from Iroha, Shizuku was said to be so depressing that some players simply quit playing the song completely. (Lyrics here).