CD Single
1st Real Face
* Official Debut
* Released: March 22, 2006
* Oricon Top 200 Weekly Peak: #1
* United World Chart; Singles: #12
* From Studio Album: Best of KAT-TUN
2nd Signal
* Released: July 19, 2006
* Oricon Top 200 Weekly Peak: #1
* United World Chart; Singles: #18
* Song used in DoCoMo Foma 902is commercial
* From Studio Album: cartoon KAT-TUN II You
3rd Bokura no Machi de (僕らの街で, Bokura no Machi de?)
* Released: December 7, 2006
* Oricon Top 200 Weekly Peak: #1
* United World Chart; Singles: #14
* Theme song for the drama Tatta Hitotsu no Koi
* From Studio Album: cartoon KAT-TUN II You
4th Yorokobi no Uta (喜びの歌, Yorokobi no Uta?)
* Released: June 6, 2007
* Oricon Top 200 Weekly Peak: #1
* United World Chart; Singles: #18
* Theme song for the drama Tokkyu Tanaka 3 Go
* From Studio Album: N/A
5th Keep the faith
* Released: November 21, 2007
* Oricon Top 200 Weekly Peak: #1
* United World Chart; Singles: #6
* Theme song for the drama Yukan Club
* From Studio Album: N/A
6th LIPS
* Released: February 06, 2008
* Oricon Top 200 Weekly Peak: #1
* United World Chart; Singles: #10[16]
* Theme song for the drama One Pound Gospel
* From Studio Album: N/A
7th Don't U Ever Stop
* Release: May 14, 2008
* Oricon Top 200 Weekly Peak: N/A
* United World Chart; Singles: N/A
* From Studio Album: N/A
CD Album
1st Best of KAT-TUN
* Released: March 22, 2006
* Oricon Top 200 Weekly Peak: #1
* United World Chart; Albums: #1
2nd cartoon KAT-TUN II You
* Released: April 18, 2007
* Oricon Top 200 Weekly Peak: #1
* United World Chart; Albums: #3