Author: KawasakiShinya

Updated on May 14, 2026 We have updated the event information. Athlete guide  have been uploaded. Please check them.

Updated on April 30, 2026 We have updated the event information. Traffic regulation details, start lists, and the event schedule have been uploaded. Please check them.

Updated: February 2, 2026 The entry deadline was originally set for January 31; however, as the Standard category has not yet reached capacity, the entry period has been extended until March 31. Please note that registration for the Sprint category is now closed. The entry will close as soon as the category reaches capacity, so […]

Updated on March 5, 2025 We are pleased to inform you that ROAD BIKE RENTAL JAPAN has kindly provided a bike rental support package for the 2025 Osaka Castle Triathlon. Please refer to the flyer below.

Updated May 25, 2025 The finisher certificates have been issued. Please download yours from here.The race results have also been published, so please check them as well.

May 14, 2025 At 12:00 noon today, we sent an email to your registered email address with a link to your My Page. From there, you can take the confirmation test. Please make sure to pass the test before the day of the event. If you did not receive the email, please log in from […]