From 1942 to 1943 during World War II, articles summarizing symposiums that Iwao KOYAMA held with Masaaki KOSAKA, Keiji NISHITANI, and Shigetaka SUZUKI (colleagues of his from Kyoto Imperial University) on topics such as ' The world's historical position and Japan' appeared in the magazine "Chuo Koron" ('The world's historical position and Japan' appeared in the January issue in 1942, 'The morality and history of the Great East Asia Co-prosperity Sphere' appeared in the April issue in 1942, and 'The philosophy of all-out battle' appeared in the January issue in 1943).
第二次世界大戦のさなか、1942年から翌年にかけて『中央公論』誌上で、「世界史的立場と日本」座談会（「世界史的立場と日本」昭和17年1月号、「東亜共栄圏の倫理性と歴史性」昭和17年4月号、「総力戦の哲学」昭和18年1月号）を京都大学の同僚、高坂正顕、西谷啓治、鈴木成高と行った。