It's not just about skill and language ability. A Japanese company has to put forward a pretty convincing argument to immigration as to why they need a foreigner to fill a position. If there's no particular reason as to why a foreigner is required then immigration is unlikely to grant a work visa. It is quite a lot of work for a company to organise a sponsored work visa.
Anyway no matter what we advise it won't ever stop people dreaming that it's easy to just rock up and get a job because they're so good at drawing cartoons!