...Some interesting irony here given that Japan is one of the few countries that never had an indigenous folklore of vampirism prior to contact with other countries (yeah, they had bloodsucking creatures and some vaguely similar yokai legends and whatnot, but nothing like the stereotypical vampire). Together, the fact that Christianity is a VERY small demographic in Japan and the likelihood of him coming across a crucifix there is unlikely.
(Then again, a place called "The Land of the Rising Sun" not having vampires in their folklore is kinda fitting in a way.)