Ok so do you guys remember the 54th Morning Musume’s single ”Brainstorming”? (the last single with Reina)
As you can see they have only one hand up.
And in their 57th single ”TIKI BUN” (the last single with Sayumi)
They have two hands up.
Sooooo….the hands are Reina and Sayumi.
A friend told me about this.