This species is characterized by strangely curled and pointed inner primaries visible here. This is apparently a molting male. Females are similar but have gray outer webs on their secondaries and less black in the lores. The bill is black only in the breeding season. In winter it turns yellowish. The "Haw" part of the name refers to berries of Common Hawthorn (Crataegus monogyna). These shy birds range across temperate Eurasia. Two subspecies have been recorded in Japan but nominate C. c. coccothraustes is a rarity. This is presumably C. c. japonicus which is widespread and breeds in Hokkaido. It reportedly has a smaller bill than nominate and less white on the tip of its tail. Canon PowerShot SX50 HS.
References:
Brazil, M. (2009). Birds of East Asia. Princeton Univ. Press.
Brazil, M. (1991). The Birds of Japan. Smithsonian Inst. Press.
Clement, P. & Christie, D.A. (2017). Hawfinch (Coccothraustes coccothraustes). In: del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona. (retrieved from http://www.hbw.com/node/61420 on 27 June 2017).
Clement, P., A. Harris, and J. Davis. 1993. Finches and Sparrows: An Identification Guide. Princeton Univ. Press, Princeton, N. J.