Square Enix has skipped steam and released most the series on Epic Games.
Link - https://www.epicgames.com/store/en-US/discover/kingdom-hearts
Link - https://www.epicgames.com/store/en-US/discover/kingdom-hearts
They usually stay exclusive for 6-12 months but a few games go further and stay only on Epic Games. In this case it looks like it might just stay on Epic Games.On the PC - do we know if these timed-exclusive for Epic or forever-exclusive to Epic?