Kashiwagi Yuki's solo debut single [Shortcake] placed number two in it's first day on sales in the Oricon chart, selling 45,333 copies. In first place was KAT-TUN's [EXPOSE] selling 80,000 copies. 3rd place is SKE48 with [Choco no Dorei].
Comparison to the other AKB48 soloists debut singles:
Itano Tomomi - Dear J - 86,681
Maeda Atsuko - Flower - 102,483
Watanabe Mayu - Synchro Tokimeki - 50,145
Sashihara Rino - Sore Demo Suki da yo - 56,879
Iwasa Misaki - Mujin Eki - 7,352
Kasai Tomomi - Masaka - 12,240