Yusuke Nomura developed tightness in his back during his last start on April 26 against Yokohama at Yokohama and was removed after four innings. He was taken off the active roster on April 27.
[UPDATE 4/29 @ 12:19am]
The Hiroshima Carp announced on April 28 that Nomura was examined at a hospital in Hiroshima and diagnosed with a strained back. His condition is not considered serious (he was taken off the active roster more as a precaution).