I'll try to avoid spoilers as much as I can, but it's difficult to talk about what makes the Anime so great without going into at least a few spoilers. First off, let's talk about what Your Lie In April [YLIA] is broadly about. Arima Kosei used to play the piano as a child, but his Mother [who was unable to live up to her full potential, due to a terminal illness] placed unnaturally high levels of pressure and expectation on him to compete and do well with the instrument. Killing all the joy Kosei had watching his Mother play the piano as a child and enjoying playing it himself, he eventually forgot about the instrument and stopped playing all together. That was until he met Miyazono Kaori, a high-on-life blonde violinist who wishes for Kosei to play as her accompanist on stage.