Melancholic Melody
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Zero loves to play the piano at the base from time to time, when she isn't out on a mission. Her friends tend to listen to it even though she mostly plays sorrowful tones.
Some ask her why she plays so many sad songs but she doesn't really know why. She just says that it makes her nostalgic and that she feels like she might remember something when she starts playing.
Sometimes Eva sings while Zero plays the piano, so they are basically doing a little concert. Usually a bit of drinking is in order after they finish playing because the woe gets to them. But occasionally they just do it for fun; those times they actually do happy/upbeat songs.
(spoilers under the cut)











