Brain Booster! Daily Calendar of Four-Character Idioms 2026 Edited by Nagaoka Shoten Editorial Department Price: ¥2100 I've already flipped through the pages for 1/1 to 1/4. I bought it thinking it would be a good mental exercise, but it didn't match my interior design style, so I gave up on continuing. It's in beautiful condition. Recommended for households with elementary to junior high school children! #NagaokaShotenEditorialDepartment #Books #Other/Other