黄色シャツの少年 (Kiiroi Shatsu no Shounen)
The Boy With The Yellow Shirt

Lyrics: ぼーかりおどＰ (vocaliodP)
Composition: ぼーかりおどＰ (vocaliodP)
Arrangement: ぼーかりおどＰ (vocaliodP)
Singer: Hatsune Miku

☆　nicovideo　☆　youtube　☆　original lyrics　☆

Note: My Japanese sucks and there's only so much I can do with a dictionary so this translation is most likely not very accurate. This is just to get a general sense of the song, so please do not repost it anywhere or use it for anything, thank you. And if someone could translate this, please inform me, thank you!
(the romaji is all good for usage though =w=b) 

これは確かに「おれらのうた」ですね！( ● ´ ー ｀ ● ) This is totally "our song" lol

( Romaji lyrics + translation )