The plot in this song is:
Tabi finds out that everytime he'd try to get rid of GF, BF is "somehow" the only way for her to make it through. But this time, Tabi decides to finish GF off by himself. After the song "Your Last Day", Tabi shoots GF, KILLING HER. BF then sees this and mourns the death of his beloved. GF's ghost then appears, telling BF that she has to go. At the end of this song, GF's ghost fades away, making BF cry in the fetal position. After this song, BF is now alone forever, without nobody to go out with. To make matters better, maybe Dawn from Pokémon would call him a "beloved" if she ever finds him sad.