Tanabe Miku and Nakaya Sayaka are forming a sub unit called "BABY GAMBA"And they're going to release their debut DVD single "Ee janai ka" on September 14
I didn't find Baby Gamba in the top 30 of today's Oricon charts, but then I realized it is a DVD release so it might show up in a different chart? I think all the DVD charts are weekly, so we might have to wait a bit longer to see how they did.