Kai is an elegant, masculine gothic (sans-serif) style typeface. It has linear structures, but is designed to retain softly finished glyph shapes. Kana characters are based on the structure of the Kodo-ken Shincho-tai typeface style.
Each character’s inherent form is naturally beautiful. Whether a character is wide or narrow, small or large, it is designed to fit inside a circle, as a correctly written kanji or kana character tends to fit inside a circle. If each character’s visual center is consistent in both horizontal and vertical directions, you will have beautiful typeset results, whatever the outer shape of the character.
For example, if multiple character elements (such as hen and tsukuri) of the 曇 character, are stacked vertically or juxtaposed side by side and put in a square, the natural character structure will be distorted. To avoid this, we simply stack or juxtapose the character elements, even if some character shapes will be narrowly condensed or their (bounding box) sizes will be very large. This is how a letterform is naturally constructed.
One basic characteristic of a Gothic (sans-serif) typeface is that stroke widths are optically aligned. Different characters need different stroke widths. Characters with a small number of strokes tend to look larger and lighter, and characters with a large number of strokes tend to have higher density and look heavier, if drawn with strokes of the same width. Spaces between strokes might be filled undesirably when printed. In this design, the density of the main character parts is as balanced as possible, instead of evenly distributed across the whole, so that characters have their own inherent, natural and attractive forms.

This font contains 2,286 characters from the Joyo Kanji List and Jinmei-yo Kanji characters, as well as additional 206 characters including kana characters, punctuation marks and Latin characters, etc.