Appears on releases
| # | Title | Length | Track artist | Release title | Release artist | Release group type | Country/Date | Label | Catalog# |
|---|---|---|---|---|---|---|---|---|---|
| Official | |||||||||
| 2.13 | UNLOCK | 3:35 | KAT-TUN | 10TH ANNIVERSARY BEST “10Ks!” (期間限定盤1) | KAT-TUN | Album + Compilation |
| J Storm | JACA-5585, JACA-5586, JACA-5587 |
| 2.13 | UNLOCK | 3:35 | KAT-TUN | 10TH ANNIVERSARY BEST “10Ks!” (期間限定盤2) | KAT-TUN | Album + Compilation |
| J Storm | JACA-5588, JACA-5589, JACA-5590 |
| 2.13 | UNLOCK | 3:35 | KAT-TUN | 10TH ANNIVERSARY BEST “10Ks!” (通常盤) | KAT-TUN | Album + Compilation |
| J Storm | JACA-5591, JACA-5592 |
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