According to the Creativeman Productions website, My Chemical Romance are set to tour Japan in February, 2011.
The dates listed are as follows:
Monday, January 31 - Osaka @ Osaka-Jo Hall
Wednesday, February 2 - Aichi @ Prefectural Gymnasium
Saturday, February 5 - Tokyo @ Yokohama Arena
Sunday, February 6 - Tokyo @ Yokohama Arena
Tickets are set to go onsale December 25.
For more information, check out this Creativeman Productions page and scroll down a bit.
Thanks for the heads-up on this information @MCRmyUnited.