Translated statement via Grok:

We sincerely apologize to our fans for the inconvenience caused.Date: September 30 (Sat) - Zepp Fukuoka / Masato (Vo)'s sudden illness  
Due to an unexpected illness of vocalist Masato, the concert scheduled for September 30 at Zepp Fukuoka has been canceled. Date: October 3 (Tue) - Crystal Lake \[CHAMPIONSHIP TOUR 2025\]  
The joint performance with Crystal Lake at Crystal Lake's CHAMPIONSHIP TOUR 2025, originally scheduled for October 3, has been canceled due to the same reason. We deeply apologize to all the fans who were looking forward to these performances. Notice regarding ticket refunds  
For those who purchased tickets for the Zepp Fukuoka show, refunds will be processed according to the ticket vendor's policy. Please contact the ticket vendor for details. For those who purchased tickets for the Crystal Lake joint show, refunds will be handled according to the ticket vendor's policy. Please contact the ticket vendor for details. We apologize for any inconvenience caused and thank you for your understanding. Additional Notice  
Due to Masato (Vo)'s sudden illness, the previously scheduled "ONE MAN JAPAN TOUR 2025 OPTIMIZE" performances at Zepp Nagoya (October 8) and other venues have also been postponed. We apologize for the inconvenience and thank you for your understanding.

Coldrain cancel upcoming Japanese concerts, frontman Masato Hayakawa diagnosed with Acute laryngitis.