um,whats the name of this song?

i dont know the name so i cant give a video but it goes like this:girl:kamaii ta go ya machi (girl and boy) soya soya no. boy: kamaii ta go ya machi hi wa hi wa no. ah ii ahhii eh mm hi wa machi naga ah toki ohh kazoe ah eh zuu zu zu ru...etc
so its a duet...its really pretty...umm yeah. please help!

× oh yeah and then after that ^ and the main choras they sing it all again but faster.