According to the official website, anime song singer Fukuyama Yoshiki will suspend his activity for the time being due to an illness. His doctor prescribed complete rest for him and his attendance at JAM Project’s upcoming concert tour “Japan & USA Ani-Son Summit” will be canceled.
Source: Fukuyama’s official website
Update July 3rd
Fukuyama announced on his official website that he left the hospital on July 2nd. He got subarachnoid hemorrhage on June 9th and was immediately hospitalized. He had an emergency surgery, which had successfully cured the hemorrhage. He said there hasn’t been any symptoms of the aftereffect.
Source: Fukuyama’s official website