Well you say that you “like Japanese tattoos” but then go on to say “but…” so I’m not entirely sure what you want. A million things could be done to cover that up. I’m sure we could help you along the way with deciding what aesthetically would be best for the cover-up, but it’s a little silly to draw you up a design without any insight as to what you desire in a tattoo (and at best you’ll probably get a quick sketch, the chances of you getting a workable tattoo design is slim). Even saying “Japanese” is pretty vague.