A certain Japanese song?

I am looking for this song which I found very calming and nice. Unfortunately I don't know the lyrics, the singer, the name, practically nothing at all


These are some characteristics that I can still remember:





1) It used to be on youtube accompanied with video of Hatsune Miku from Vocaloid


2) The singer is probably middle aged man (from his voice)


3) I'm pretty sure this song is somehow about summer


4) I'm certain there's the word 'Hanabi' (meaning fireworks) in the song


5) The song is slow, without drums





I know it's pretty much vague, but still if you think you know, share it with me. Thank you very much|||Was the singer Gackt?He's a middle aged man who is a very popular singer in Japan.Also,some of his songs are accompanied with Miku because his voice was used to make the vocaloid Gackupo.





Some of his songs:


Mizerable-http://www.youtube.com/watch?v=MlpM15ByR…


Lost Angels-http://www.youtube.com/watch?v=mkl39Za6a…


Love Letter-http://www.youtube.com/watch?v=Nx1ARmlSd…


Last Song-http://www.youtube.com/watch?v=XFaJUYTRq…


Setsugetsuka-http://www.youtube.com/watch?v=9f2zuY45k…





He's the only singer that I can really think of.Sorry if it's not him.