"Kokoro no oku de shiroi MISAIRU ga hajiketa ato wa fukai KURE-TA-!
nemurenai mayonaka ni nandomo
kawaita omoiga kasuka ni hikaru yo?!

machi wo terasu yo..."
Translation:

"Deep in my heart a white missile explodes leaving behind a deep crater!
How many times at midnight
Have my dried up memories faintly shone?!

Shine on this town..."
ROJIURA NO USAGI by ASIAN KUNG-FU GENERATION

I think it's the most relevant thing you can hear when you are
struggling to get over something you lost and desperately want back.The song is amazingly upbeat and has incredible instrumentals.But this is my interpretation.I especially like that "Machi wo terasu yo..." it expresses that long I feel for that I hold.Oh and here is the song for the hell of it.

Rojiura no Usagi