I'm assuming because the lawyers managing the bankruptcy process tried recovering a certain amount of money in Yen, with the books being handled in Yen. Normal

I'm assuming because the lawyers managing the bankruptcy process tried recovering a certain amount of money in Yen, with the books being handled in Yen. Normal people deal with currency, not Bitcoin. Especially in 2013. In bankruptcy proceedings, most assets are sold off and the remaining cash is distributed to shareholders and the likes. You're being paid out your Yen amount (just like any other person who had a claim) but converted into Bitcoin (at todays prices, since the Bitcoins are gone / have been liquidated).