There is vol 4.........i saw the raws and i feels troubles.........

Link please...

There is also vol 5 and i don't know where to find the vol 6

yeah but vol i cant find.......

http://onlyrawbl.blogspot.com.ar/2016/05/hitorijime-my-hero-raw.html

only this from vol 5
http://page12.auctions.yahoo.co.jp/jp/auction/p522290776

The reason you can't find vol 6 is because it doesn't exist yet.
The fifth volume just came out this July in japan, volume 6 is still currently ongoing. It probably won't be published as a tankobon until at least by the end of the year but most like until early next year.