While the prequel, Octopath Traveler: Conquerors of the Continent is making its way to smartphones it appears that the original Octopath Traveler is headed to Steam with it getting a new PC rating in Korea. [Thanks, Gematsu.]
The turn-based RPG developed by Acquire originally released worldwide for the Nintendo Switch in July 2018 and has since then remained exclusive to the platform. The rating from Korea shows Bandai Namco, the company that regularly publishes Square Enix games, as the publishers for Octopath Traveler on PC.
Octopath Traveler is available for the Nintendo Switch. Octopath Traveler: Conquerors of the Continent launches in Japan in 2019 for iOS and Android, and you can read more about it here.