想い出をありがとう is unlockable in Pop'n Music 11 (CS) as part of the POP'N TOURIST unlock system, obtained in Russia.
想い出をありがとう is the only song in the CLASSIC series that has a Japanese title.
想い出をありがとう marks the last contribution of Junichiro Kaneda to the pop'n music series.
想い出をありがとう is one of the songs that is part of Phase 2 of the "Fever Senshi Pop'n 14" (フィーバー戦士 ポップン14) event. It could be unlocked from July 12th to July 19th, 2006.
From July 26th, 2006, 想い出をありがとう is available by default.
