back number are a pop rock band from Ōta, Japan. http://backnumber.info/
In 2004, the band formed in the mind of Iyori Shimizu in Ōta, Gunma Prefecture. Though there were many member changes, it's been the same members from 2007 to now.
On February 18th 2009 the first mini album 『逃した魚』(nogashita sakana) was released.
TOWER RECORDS recommended item 「タワレコメン」(towarecomen), HMV recommended item 「HOT PICKS」for the first time, and featured in many other shops acrosss the country.