514 kilometers, from Nihonbashi to Kyoto.

Wed, 08 Jul 2026 00:00:00 +0000

The Edo-era couriers ran from Nihonbashi in Tokyo to the Sanjō Bridge in Kyoto — five hundred and fourteen kilometers. The fastest, three days and three nights. An ordinary traveler took fourteen to fifteen days.

Fifty-four post stations lined the way. Shinagawa, Kawasaki, Kanagawa, Hodogaya, Totsuka, Fujisawa, Hiratsuka, Ōiso, Odawara… Each station carried its own scenery, its own story. The journey progressed in units called “stations.”

HIKYAKU’s conversion of daily scores into a 514-kilometer journey is not decoration. “Distance” as a metaphor has a deep effect on habit formation — and there is solid cognitive science behind it.

Four paths, four bodies.

Wed, 24 Jun 2026 00:00:00 +0000

“Which mode should I start with?” — a common question.

Light Keto (12-hour fast), Keto Body (16-hour), Town Courier (18-hour), Express Courier (20-hour) — HIKYAKU’s four modes are not simply “different durations.” As the fasting window extends, what happens inside the body shifts qualitatively. Once each step of the staircase is understood, the right starting point becomes visible.

12 hours: the quietness of insulin

Finish dinner, skip breakfast — or eat an early dinner and a normal breakfast. Either way, twelve hours is within reach.

HIKYAKU on 飛脚 / HIKYAKU

514 kilometers, from Nihonbashi to Kyoto.

Four paths, four bodies.

12 hours: the quietness of insulin