Because Tanaka releases her DVD on the same day, I wouldn't be surprised if she leads this single with whoever joins from HAPPY8. Kind of what happened with Risa and Reina herself for Shabondama.
rui@JPM posted a tentative title that apparently comes from Sony Music NewsAshita no Tame ni
WOW!! WOW!! WOW!!
Maybe <3. But the group seems to be divided in couples, according to the outfits they're wearing.
^ it looks to me like Eri and Risa are wearinig similar clothing. Maybe Reina is soposed o be in the Koha/Aika theme? I can't tell what she's wearing, but to me, it looks like it could possible be a uniform.