Ishihara joined Seiko in 2003 and has been a key member of the design team for Prospex and Grand Seiko since 2014. Currently serving as the Design Director of the Design Development Team.

It is no exaggeration to assert that the question of how to express the "pleasant flow of time" profoundly shapes the worldview in watch design. Reflecting on the lives of our ancestors, who rose at sunrise and retired at sunset, I realized that this harmony with nature constitutes the "most luxurious flow of time" in our contemporary era.
Upon contemplation, I wondered: Can modern individuals experience the serene temporal rhythms akin to those of our ancient ancestors? This contemplation led to the conceptualization of a watch exclusively crafted for "sunny men," individuals immersed in the brilliance of daylight, guided solely by the sun's temporal trajectory. Under the bright and brilliant sun, only the movement of shadows imparts the sensation of temporal progression. What a wonderful way to spend time, with a gentle breeze and the sun smiling down on you! Cloudy? Rainy? Such words are meaningless, because this watch is dedicated to the "sunny men"—those who are blessed by the sun.

A sundial? I see that it follows the oldest timekeeping method known to mankind. Yet, for it to display accurate time, numerous conditions must be met. So, surprisingly, it can transform! It can be leveled, the dial angle can be changed, it can be rotated left and right, and even the orientation of the case itself can be adjusted with the changing of the seasons? Considering it even encompasses the equation of time, it really is a highly precise mechanism that covers every aspect! ...And yet, isn't this useless unless it's a sunny day? Is it intended for sunny men only? Well, I’m a rainy man, so let's have all of us rainy men wear the ultra-precise Kodo that I invented...

At first glance, this watch, designed exclusively for ‘sunny men,’ may appear as a mere piece of metal, but that's just a fleeting impression. This product transforms into a "miniature astronomical observatory," capable of meticulously tracking celestial movements with a high accuracy of -1.59 milliseconds per day, or -0.58 seconds per year.