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A beautiful overview of the month.
The Aeternum Calendar is a dated monthly diary designed not only for "writing down appointments," but also for "beautifully viewing" the time of the month. It features a simple layout without vertical lines and uses "Bagasse FS Sugar" paper, known for its excellent writing feel and characteristics. Each month has an independent front and back cover, allowing you to bind only the months you need or store completed months. This refill is designed to help you clearly grasp the outline of the month, to confront time, and to enjoy writing.
Available in 3 sizes, including the rare Mini 6 Narrow
The calendar comes in three sizes: Mini 6, Mini 6 Narrow, and M5. Among these, the Mini 6 Narrow dated monthly diary is a rare find on the market. The Mini 6 Narrow has the same vertical length as the Mini 6 and the same width as the M5, making it a slim size. It combines the writing capacity of the Mini 6 with the portability of the M5, resulting in a slender and elegant format. To match its unique aspect ratio, the layout is designed to make it easy to view and write in your schedule, even within the limited space.
M6
Mini6 Narrow
Micro5
We also offer a rare Mini 6 Narrow monthly diary with dates.
Simple format without vertical lines
We intentionally omitted the vertical lines that separate each day's schedule section, neatly arranging only the necessary elements such as the date and day of the week. Because there are fewer obstructions to the eye, the written text stands out naturally.
It can be used freely for appointments, deadlines, anniversaries, short notes, and more. The ample margins allow you to easily see at a glance whether you have many or few appointments.
The design allows you to naturally write in appointments that span multiple days, following the flow of events. Because of its simple layout, your personal writing style and decorations beautifully stand out.
From August 2026 to the next summer
The coverage period is 12 months, from August 2026 to July 2027. To allow you to feel the seasonal atmosphere on the refill, the printing color of the month names changes every three months to match the seasons. The colors are the same four as the Aeternum Diary.
The printing color of the month names changes every three months.
• July-September = Crystal Sky
• October-December = Harvest Orange
• January-March = Velvet Mocha
• April-June = AURA ARCA Sage
The printing color of the month names changes every three months.
• July-September = Crystal Sky
• October-December = Harvest Orange
• January-March = Velvet Mocha
• April-June = AURA ARCA Sage
Each month can be filed independently.
Each month has an independent front and back cover. You can bind only the months you need into your system planner, and remove and store the months you've finished. You can freely adjust the amount you carry, keeping your future plans light and preserving the time you've spent writing.
Each month has a front and back cover, and can be removed and filed one month at a time.
Easy-to-understand weekly flow with a Monday start
The Aeternum Calendar starts on Monday. The calendar allows you to see Monday through Sunday in order, making it easy to match with your work or school schedule and clearly distinguishing between weekdays and weekends. Japanese holidays are also included, allowing you to easily plan long weekends and holidays.
Monday start, includes Japanese holidays. Naturally grasps the flow from weekdays to weekends.
Soft writing feel of fine paper "Bagasse FS Sugar"
Because this is a monthly diary that you open and write in repeatedly, we also valued the pleasant feeling you get each time you touch the paper.
The paper is the same uncoated, high-quality paper "Bagasse FS Sugar 90" as the Aeternum Diary. It features the natural texture of uncoated paper. The writing feel is neither too smooth nor too rough; the pen tip moves smoothly across the paper, comfortably supporting the writing motion. With a substantial thickness and firmness of approximately 104.7 g/m², it's easy to turn pages and works well with a wide range of writing instruments, including fountain pens, ballpoint pens, pencils, and markers. Even with stamps, ink bleed-through and show-through are unlikely, allowing you to use it with confidence even when writing multiple entries.
Bagasse FS is an environmentally friendly fine paper that utilizes sugarcane residue. AURA ARCA values not only writing feel and practicality, but also the philosophy behind the selection of materials.
The paper is the same uncoated, high-quality paper "Bagasse FS Sugar 90" as the Aeternum Diary. It features the natural texture of uncoated paper. The writing feel is neither too smooth nor too rough; the pen tip moves smoothly across the paper, comfortably supporting the writing motion. With a substantial thickness and firmness of approximately 104.7 g/m², it's easy to turn pages and works well with a wide range of writing instruments, including fountain pens, ballpoint pens, pencils, and markers. Even with stamps, ink bleed-through and show-through are unlikely, allowing you to use it with confidence even when writing multiple entries.
Bagasse FS is an environmentally friendly fine paper that utilizes sugarcane residue. AURA ARCA values not only writing feel and practicality, but also the philosophy behind the selection of materials.
"Bagasse FS Sugar" comfortably accommodates a wide range of writing instruments, from fountain pens to markers.
It has a firm paper thickness that resists bleed-through even with fountain pens that have good ink flow.
Reusable, envelope-like packaging
We also paid attention to the packaging. The design resembles an envelope, with a flap that opens and closes by inserting it into a slit. It can be reused for carrying stock refills or storing refills after writing. If you store a year's worth of records, month by month, it will eventually become your own precious treasure.
Open and close by inserting the flap into the slit. Reusable for carrying and storage.
■Specifications
• Dated monthly diary
• Size: Mini 6 / Mini 6 Narrow / Micro 5 (M5)
• Coverage Period: August 2026 - July 2027 (24 sheets, 48 pages total)
• Each month has a front and back cover (each month can be filed independently)
• Starts on Monday (includes Japanese holidays)
• Paper: Bagasse FS Sugar
■Size
Mini 6: H126 x W80mm (Hole diameter 4mm)
Mini 6 Narrow: H126 x W61mm (Hole diameter 4mm)
Micro 5 (M5): H105 x W62mm (Hole diameter 3.5mm)