I found this in Kinokuniya, beside calligraphy brushes, brush pens and student sumi ink. The Platinum Soft Pen is a felt-tip, demonstrator-style pen. It comes with a cartridge of red ink, “Marking Red,” and a spare felt tip.
I decided to pop in a Nakaya goldfish converter, thinking it would look good showing through the transparent barrel.
Next, I filled the converter with Noodler’s Golden Brown.
The ink traveled quickly to the felt tip, and I was able to start sketching less than a minute later.
This drawing used up a lot of ink. To color wide areas, I used the pen almost parallel to the paper.