November was not a good month to release a single. Too many other groups released at the same time, making it difficult for casual fans.
November 2 - Dempagumi, C-ute
November 8 - GANG PARADE (album)
November 9 - Nogizaka46 (Hashimoto Nanami's last), Little Glee Monster, Tokimeki Sendenbu, Kiyoshi Ryujin 25, FuwaFuwa
November 16 - AKB48 (Paruru's last), Ebichu, BiS (album), Iketeru Hearts, lyrical school (album)
November 22 - DEAR KISS (now with Nonoko), Underbeasty, HakoMusu
November 23 - Morning Musume, Rocka Japonica, Chu-Z, YumeAdo, Ayumikurikamaki, NEVE SLIDE DOWN (mini-album), BPM15Q (album), Tau
November 29 - MAPLEZ, Kozuki Serena
November 30 - Keyakizaka46, Tokyo Girls Style, E-girls, TIFKA LADYBABY, Maison book girl
Only listed the major ones or ones I have an idea of being popular at the moment in the Japanese idol scene. I don't keep track of the boy bands or K-pop groups but ppl go crazy for those too.
Waiting until the first week of December might have helped their rank since there's no one really except Kamiyado and 3min. as far as female idols go.
All those palet graduations seem to have landed them back in indies. They're no longer with Columbia.
3min losing Mayu and Hina and Yoko was no good. They still haven't updated their site to include the new member Ramu either despite her being with them since the summer.
predia seems pretty solid but I wonder how much longer they have.