Writing weekly with a fountain pen. Simple like a blank map, with only the necessary items listed, allowing for free customization. Chosen with the intention of writing with a fountain pen, it uses "Dandereido COC," a material that prevents ink from bleeding through and offers a pleasant texture. It opens fully to 180 degrees, making it easy to write in, and dries quickly. This original product was created through a joint project by Buntokid.com, Yamato Publishing Printing, and Pen and message. Based on the concept of including only the most essential information, it features the Rokuyo (traditional Japanese calendar), holidays, lunar phases, and week numbers. It's a comprehensive diary that allows you to manage your year, month, and weekly schedules all in one book. *The pages are arranged in the order presented in the item description. The last four pages are free pages with grid lines. *Year printed on the spine. Size: [Height] 158mm [Width] 158mm 128 pages (1 week per spread: starts January 2026) [Thickness] 9mm 3,190 yen (tax included) Photos 14 and 15 show the actual product.