Spitz vocalist Masamune Kusano is currently experiencing poor health, forcing the band to cancel its upcoming concerts.
The band announced Kusano's condition on its official website.
"Due to the poor health of Masamune Kusano (Vo.), we have decided to postpone [our concerts]. We deeply apologize to all the fans who have been looking forward to the concerts for the inconvenience," the statement said.
The nature of Kusano's ailment was not immediately disclosed.
The affected tour dates were the band's December 12 and 14 concerts. People who had purchased tickets for those dates will be able to transfer the tickets or receive a refund. Details on this process will be announced at a later date.