Saeko's surname is unknown. She belonged to the Play Faction during the Survival Game, along with one of her best friends Mihara Kozue. Her first voice debut was in episode 4 for the 2nd Term.

She shows herself to be eloquent and suave when it comes to dealing with guys and is a master of seduction able to quell even the likes of Kouriyama. She was Cafe Rumble's #1 girl.

Saeko has a weird sense of humor; the script she submitted for class 2-C's play was among the more colorful.

Saeko also features herself on the front cover of volume 11 of the Manga along side Tougou Masakazu.

Mihara Kozue: Kozue and Saeko are often shown chatting in the hallway