First off, this song and 'Tawagoto Speaker' are freaking awesome. Nekobolo's cool. So here's my little theory for the first one. (I hope no one's come up with it yet before..) (I am going to quote this translation: http://vocaloidlyrics.wikia.com/wiki/%E8%87%AA%E5%82%B7%E7%84%A1%E8%89%B2_%28Jishou_Mushoku%29 and JoyDreamer's: . Also, this might get repetitive.)
I'm not 100% sure, but in 'Self-Inflicted Achromatic', I think the narrator is Death. Achromatic means it has no colour, and it's usually pictured as black and white. Personifications of death also usually are in just black and white, including the Grim Reaper.
(My sister gave me