Source: http://www.capcom.co.jp/ir/english/finance/salesdata.html
(Use wayback machine)
Series sales (rounded down to two significant figures)
As of:
September 30, 2017
Okami: 1.6M
December 31, 2017
Okami: 2.0M
March 31, 2018
Okami: 2.1M
June 30, 2018
Okami: 2.2M
September 30, 2018
Okami: 2.4M
Okami HD released released on PS4, Xbox One and Steam in December 2017. On August 2018 it was then brought to Switch.
Okami series sales have risen by 800k since Okami HD released so it's very likely the majority of sales came from Okami HD.
(Use wayback machine)
Series sales (rounded down to two significant figures)
As of:
September 30, 2017
Okami: 1.6M
December 31, 2017
Okami: 2.0M
March 31, 2018
Okami: 2.1M
June 30, 2018
Okami: 2.2M
September 30, 2018
Okami: 2.4M
Okami HD released released on PS4, Xbox One and Steam in December 2017. On August 2018 it was then brought to Switch.
Okami series sales have risen by 800k since Okami HD released so it's very likely the majority of sales came from Okami HD.