Sega had posted sales numbers for SMTV/Vengeance in their new report, but for now the numbers are down since apparently there was a mistake somewhere.

Page 25 here, but like I said it's down for now.
https://www.segasammy.co.jp/cms/wp-content/uploads/pdf/en/ir/20250618_Management_large_MTG_all_e.pdf

If the previous numbers for V/Vengeance are correct, together they crossed 2 millions. Vengeance's launch sales numbers were also almost equal to V's launch, but no later quarters, so we don't know its legs.