Kakimori x TSUKI no IRO: Frost Fountain Pen (Extra Fine) Hobonichi Techo Exclusive Color · Hobonichi

The Hobonichi Techo uses 12 soft colors across the book. The TSUKI no IRO stationery series incorporates these colors into simple designs.

These pens are a special collaboration made with Kakimori, a stationery shop that crafts fountain pens, inks, notebooks, and more, all created for “people who write with joy.”

Frost is an original Kakimori pen featuring a translucent body with the texture of frosted glass. It is thoughtfully designed so that even the faintly visible ink and nib become a part of the pen’s overall design.

The pen features an easy-to-open screw-on cap and a grip section made as long as possible to keep your fingers off the ridges while writing. Every detail has been refined to eliminate unnecessary elements, while still conveying a sense of both modernity and charm.

For this collaboration, we’ve kept all the beauty and ease of writing that Frost is known for, while giving the body a khaki gray color exclusive to the Hobonichi Techo, with the TSUKI no IRO logo added in silver. The translucent material means you can enjoy watching how the pen changes in appearance once it’s filled with ink.

The fountain pen offers a smooth, flowing writing experience, while the rollerball is a ballpoint-style option for everyday use. The fountain pen comes in an EF (extra-fine) nib width, perfect for writing small, detailed entries in your techo.

Both pens use a converter system, meaning you draw in ink yourself. We recommend pairing them with the TSUKI no IRO pigment ink or the mini ink bottle sets.

How to use and care for your pen

How to fill with ink
Frost is a converter-style pen. Please fill it with ink before use.

Instructions for refilling:
- Fountain pen
- Rollerball pen

How to clean your pen
With proper, regular care, your pen will last for many years.

Cleaning instructions:
- Fountain pen
- Rollerball pen

How to use the cleaning solution
If ink has dried and hardened inside the nib, please use a cleaning solution.

Cleaning solution:
- Purchase here
- How to use

Replacement nibs
The nib can be replaced. Whether your pen has stopped writing or you’d like to switch from a fountain pen nib to a rollerball, replacement nibs are available. Please visit Kakimori's website.