Sayaka, along with the rest of AKB0048, hold a secret concert in an abandoned mine on Lancastar. The DES tried to stop them, but AKB0048 quickly defeated them before leaving Lancastar.
4 years later, Sayaka and the rest of AKB0048 appeared on a hologram card that Yuka had received, telling them how to do the auditions.
Later, Sayaka and the rest of AKB0048 came to the rescue of the auditioners when the DES took over a ship in order to search and capture the auditioners. They managed to rescue the auditioners, defeat the DES and making an escape on their ship before the DES could catch them.
Sayaka appears in Episode 3, force feeding steaks to the trainees, telling them to build up their energy.
In Episode 5, she and Sae attempt to make Mimori more of a tomboy, which does not go well. At the end of the episode, she shows true wisdom in mentioning that although the girls strive to be like the previous members of AKB0048, it is their friends they depend on to make them better.
In Episode 6, Sayaka comes to teach the trainees about image and personality, along with Takamina and Yukirin. She crushes Makoto's hands and intimidates her as she talks about the handshake event. As an injured Makoto whimpers and nurses her throbbing hands, Sayaka warns the other trainees not to borrow clothes from Takamina or Yukirin,
as they are the "Twin Towers of Bad Fashion". She later appears briefly at the handshake event watching a crazed fan attempting to drag off Sae.
Sayaka appears briefly in Episode 7 during the practice rehearsal scenes.
Sayaka Akimoto was born on July 26, 1988 in Chiba Prefecture, Japan. She joined as a member of the 2nd generation. She is was captain of Team K, and as such was originally featured in many of the group's singles. From 2011 to 2014 she was a member of AKB48's Sub-Unit DIVA along with Sae Miyazawa, Umeda Ayaka and Yuka Masuda. She loves martial arts and is half Filipino. On April 7, 2013 she announced her graduation from the group and graduated on August 22, 2013. She is best friends with Yuko Oshima and Sae Miyazawa.