Bank of Japan Gov. Toshihiko Fukui revealed Friday he may have earned several million yen a year from his investment in a fund set up by now-arrested financier Yoshiaki Murakami.

Speaking before the Diet, the BOJ chief repeatedly declined to provide details about the investments, promising to submit relevant information to the Financial Affairs Committee by Tuesday — two days after the current Diet session adjourns.

Fukui again refused to step down, saying he will fulfill his duty by steering BOJ policy properly, while taking the harsh criticism he has received to heart.