Acter Takeru Sato, the star of TV Asahi's "Kamen Rider Den-O," revealed on his official blog on Saturday that he is currently in poor health. According to Sato's management, he complained of pain in the left side of his chest on Thursday. He was taken to a hospital, where he was diagnosed with pneumothorax, also known as a collapsed lung - a hole had opened in his left lung, causing air to escape and his lung to shrink.

Fortunately, it appears that the condition was not too serious. He has been ordered to rest for about ten days, forcing him to cancel a scheduled talk event at Kobe Gakuin University on the 4th. He will continue to receive medical treatment after the recovery period.