Famitsu sales: Week 42, 2021 - (11th Oct - 17th Oct)

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src said:

If PS5 sells 9-10M and 60-80M software then its continued what the PS3 and PS4 generally did, showing that there is a stable userbase in Japan.

Stable, but at a relatively low level. They're very much a secondary player in the Japanese market in terms of both hardware and software.