The HON planner, named after the Japanese word for "book," is designed with a hardcover resembling a classic book. Among its variations, the Slash series stands out with its classic yet distinctive features: available in dark navy or ivory, adorned with a gold foil slash reminiscent of the forward-slash symbol used in date writing. Its cover is crafted from a durable, high-quality cloth.

Crafted to evoke the feeling of carrying a beloved book, the series encourages easy access for note-taking anytime. The A5 size boasts a page per day featuring a 3.7mm grid layout—a meticulously researched size ensuring an easy-to-write-on square grid.

The HON includes two attached bookmarks, one navy and one beige, facilitating easy navigation to frequently used pages. Additionally, an A5 pencil board with a built-in pen holder is an exclusive feature of the HON series. The paper material is durable and thin Tomoe River S paper, bound together in a thread-bound book that lays flat for effortless writing.