Thread:Sakurairo/@comment-30379300-20170621165739/@comment-29752621-20170813155535

I don't think so, it's for part 3 which is right before 4 (which would be the half-way point when it's out of 6). I think it's the bonus song so that we don't have to wait for another full mini-album release to get it (sort of like Star Jet). But then again, Star Jet did become the new OP part-way through and So Beautiful Story stayed there... So maybe Message of Rainbow will stay as an OP for a few weeks like 1, 2,  Sing for You did