“Secret method” in Japanese
Short answer
Secret method in Japanese is “秘方” (hihou). Full meaning: secret method, secret recipe, (prescription for a) secret medicine.
Other ways to say “Secret method” in Japanese
秘法
hihou secret method, secret process, secret formula; esoteric rituals (in Shingon Buddhism)
秘策
hisaku secret plan, secret scheme, secret stratagem, secret method
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