Aww..I haven't had a Japanese rooster before but my Cochin rooster was loud. The only rooster I had that was kind of quiet was a silkie who had a somewhat deformed crow. I had him in a box in the garage and took him out at the latest possible time every morning but I had to rehome him before I moved because I didn't want to put my remaining family who still lives there through the trouble of taking a flashlight out and putting him in the box each night and taking him out each morning. I suppose you could keep him until about 6 months after he has fathered some chicks then rehome him or "borrow" a rooster from someone but that could be more difficult if the hens aren't used to the rooster plus having to quarantine it.