Guns are not allowed in Japan
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Oh by the way, Japanese swords are not permitted either. Did you know that?
So, if you are visiting Japan, DO NOT BRING YOUR KNIFE!!!
Any fixed knife containing a blade length of 15 cm or more requires permission from the prefectural public safety commission in order to possess. Permission requirements also apply to any type of pocket knife over 6 cm (including Automatic Knives), spears over 15 cm in blade length, and Japanese halberds.[32] All knives with a blade length over 8 cm are prohibited from being carried, under a crime law,[33] with an exception for carrying for duty or other justifiable reasons. Possession is considered a petty crime and is not usually punishable by prison time. However, in cases where assault occurs with the knife, there is a penalty of up to 2 years prison or up to a ¥300000 fine. Folding knives with a blade length less than 8 cm (such as Swiss Army knives) are permitted, while SAK with a lock blade are prohibited from being carried.