Despite being in the business for 20 years , Fukuyama-san doesn't release singles that often as compared to other artistes such as B'z since he also acts & do photography on the sideline but from what I know he had a couple of million selling singles
his best selling single is 2000's Sakurazaka which sold a whopping 2,299,320 copies
so much so that the song was being covered twice
but anyway it doesn't seem that he has a #1 streak going on in him . His 1st few singles never charted to begin with D:
so maybe ayumi's chances to get #1 is quite OK/high ? I don't think Fukuyama-san mind settling the #2 spot