|Family||Katsutaka Imae (boyfriend)|
|Manga Debut||Round 445|
|Anime Debut||Round 4 (Rising)|
She and Imae were together prior to the start of Imae's boxing career. Imae dumped Sachiko to focus on his boxing, subsequently becoming champion. Sachiko first appears in the story trying to make up with him before his title defense against Aoki Masaru. He denies her without any sympathy.
Following the match between Imae and Aoki, Imae apologized to Sachiko and they got back together.