I’m less familiar with UK curries, but in general Japan tends to prefer sweeter food than India, so the curries would reflect those differences. Nowadays (in the last 5-10 years-ish) spicier options have become more widely available, but the traditional dishes still reflect the differences.
Is Japanese curry basically like the curry you would get from a chipper in the UK?
I’m less familiar with UK curries, but in general Japan tends to prefer sweeter food than India, so the curries would reflect those differences. Nowadays (in the last 5-10 years-ish) spicier options have become more widely available, but the traditional dishes still reflect the differences.