Aged 42. Adjunct lecturer in Japanese medieval history at several universities while also working as a technical writer and fact-checker for history magazines. Lives frugally, channeling every leisure yen into rare-book purchases and field trips to castle sites across Japan. Frustrated by the wave of dramatized, source-less history articles flooding the web, he writes to plant a primary-source anchor where general readers can find it. His prose is cold and academic — no emotional flourishes, always pairing era names with Western dates, always citing first-hand sources such as the Azuma Kagami and Shincho-koki.