Context always matters but specifically to the term "blowing up", you're talking about something having sudden surge in popularity and interest. Doesn't mean it has to be competing with the best sellers of all time.

There are countless Bandai Namco games on the Switch, and Sparking Zero is arriving next month with a NS2 edition arriving with it. Elden Ring is also coming wherever that is ready. I simply don't know where you got that idea from.

Oh, and this is a thing that happened too: https://www.nintendolife.com/news/2025/07/digimon-story-time-stranger-switch-2-listing-surfaces-online

Digimon's primary platform has been Playstation since PS1 days.

Bandai Namco favors Playstation moreso when it comes to their Anime franchises.

Also worth mentioning that Sony just invested in Bandai Namco over the summer with just under 500M for a 2.5% share ownership which is more than Nintendo's 1.75% share and Sony signed a strategic agreement with them to develop and strengthen IP. 

Yeah and for Capcom PS was also the main platform but it is PC now.

Also sales in Japan doesn't scream main platform.

6th [PS5] Digimon Story: Time Stranger
23,779 (New) total 23,779 / Bandai Namco Entertainment / October 2, 2025

Digimon Story: Time Stranger pre-orders exceed Bandai Namco’s expectations, physical copies to be scarce at launch  - AUTOMATON WEST

Namco already made a statement that pre-orders were higher than expected for physical and stock was sold out. They will do a restock but for now it probably drove an even higher attach rate for PS5 digital because of this. 

And that's great for Capcom on the PC side but it doesn't stand for every publisher. Capcom even called Monster Hunter Wilds main platform the PS5 initially and well we all know the bad optimization that crippled the sales on that game on all platforms. Still though, without any PC Japan sales data you can't really refute BasilZero's claim at this time, especially with the above info.  

yes true, if you think is a main market for Digimon, this is very low compared to steam figures

are digital sales included?

No, digital sales are not included and there was a shortage of physical copies. Also, Steam figures for concurrent and all time players are a global chart for all regions. All you're seeing in the copied data above is launch physical PS5 copies for Japan only.

Is there any franchise on PlayStation where Japan remains the main market? Genuine question 

A good congrats on such an achievement!
Although it can't truly be said if the Japanese PC market is exactly the cause of such a number.

Globally, it sure garnered an interest unlike few of their previous outings. So it's good to see Digimon strolling around.