The current open sale price will be offered until one month of publication.
This mainly concerns purchases made in currencies other than dollars.
For example, today the price is 150.5 yen to the dollar, but Steam's default setting was applied at 116 yen to the dollar.
The default currency rate was applied at the time of publication, and those purchasing in Japanese yen are saving 23% against the dollar.
The author applied to Steam for pricing with the most recent currency rate, though,
Steam has replied that the game price cannot be changed for the first 30 days after release.
We will be offering the game at the sale price for a while.