>>191354225Billions of yen sounds off, at least for Kyoto Animation's total involvement. The 2.3 million raised by the GoFundMe from Sentai (which won't all go to Kyoto Animation because GoFundMe takes a cut) comes out to 250m yen. Even if each of the 70 victims, dead and living, took $100k each in medical / funeral expenses, you're talking about $7m dollars in total medical bills, that's still less than a billion yen (roughly 760m yen). To drive it up to over a billion each person will need $9.2m in total expenses or ~$131k each person. Certainly doable.
To be "several billions", which implies 3 billion or more, you're talking about $394k each person. While costs for severe burns in the US can be ridiculous, with the highest extreme end marks pushing $10m in treatment costs. However, severe non-fatal burn injuries account for ~1% of all workplace injuries and in 2018 that's roughly 28,000 people. Total burn costs annually for burn victim treatments run ~$10.4 billion. That's an average of $371k per person in treatment costs. So, maybe it could get to the several billions. 70 total victims (which includes the fatalities) would put them to that point. Without the fatalities, tho, it wouldn't get close. Also, with insurance there's no way Kyoto Animation is going to have to pay that out of pocket.
So, I don't think this will cost Kyoto Animation several billions in treatments to burn victims. Sure, some of the more severe ones will be highly expensive, but some of those people got out without massive injuries, so they won't cost as much. I think the "several billions" is a bit of an overestimate.