Manga and their anime adaptations are often popular around the world (France has been its biggest importer and consumer since the 70s, and according to this
article mangas have currently taken hold of 50% of the french comic market), but those media are still created to be consumed by the japanese audience firstmost. Japanese authors are not going change things because there is seemingly a bigger audience outside Japan that is divided across several multiple countries. The same can be said for japanese games as a general rule as well: they can be popular outside of the home country but they were made for the japanese audience firsmost unless exactly told otherwise. There is no detailed hard data available anyway, at least for the public, that could prove one specific country generate more sales of japanese games than Japan itself in order to claim a general truth as such. Hence the reliance on claiming shipments (to retailers) in related news because the infrastructure in western countries don't seem good enough to keep track of sales like Japan does with Famitsu and Media Create (which
has shipment stock represented as a colored bar alongside of the sale numbers)
