Source here
...Octopath Traveler, Square Enix's unusually titled RPG for Nintendo Switch. It's actually a really good result for the game, as its sales are almost double that of Bravely Default (which is made by the same team back in December 2012) and more than double that game's sequel Bravely Second (release in 2016).
Indeed, the charts are so close that if we did this in terms of revenue, Octopath Traveler is No.1 due to its higher price tag. Octopath Traveler is the No.1 performing single platform game of the week.