Hanasato Sayaka is a former fourth generation member of AKIHABARA Backstage pass.
- Name: Hanasato Sayaka (花里明香)
- Special Skill: Making a strange face
- She is the only fourth generation member who was not featured in episode 97 of Tsunstube, it is possible that she may have left by the time the episode was aired; therefore she was edited out.
- Her debut performance in the cafe was "Karikeiyaku no Cinderella" by Shiritsu Ebisu Chugaku.
- Whe asked why she applied for AKIHABARA Backstage pass, she didn't answer.
- She hasn't participated in any AKIHABARA Backstage pass events, and was never listed on the ABP website.