I did it. I had page-no-sidebar.php file. Then i just replaced code in single.php with code copied from page-no-sidebar.php and it worked 🙂
http://6ames.nazuka.net/2012/09/title-test/ (it’s just for test’s not my main site, but it is using same theme)
I think i found where to remove sidebar ( should i remove <?php get_sidebar(); ?> from single.php ? )
