4. What is the name of that mystery？
Lyricist：
Writer(s)：
？
3D
？
a people only
heart beat! new sensation!
heart beat! new sensation!
!
knock and knock
!
by
get set
OK
busy
heart beat! new sensation!
heart beat! new sensation!
!
roll and roll
!
with
knock and knock
!
by
get set
say I love you!
say I love you!
!
What is the name of that mystery？
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