Ninja Memory Techniques 記憶術 (Kioku-jutsu) by 山田雄司 Yamada Yuji for Hiden Magazine, September 2021 issue. 現代を生き抜く知恵を忍者の術と心に学ぶ！Gendai o ikinuku chie o ninja no jutsu to kokoro ni manabu!(Learn the Wisdom to… Read More »記憶術 Ninja Memory Techniques