In her first encounter, she wears a funeral attire consisting of a black blazer over black blouse, a black skirt, a pair of black leather heels, and a pearl necklace. Her normal attire consists of a white blazer with black inserts over black blouse with matching white short skirt and a pair of black leather heels.
Saeko is a shrewd and intelligent woman with a knack for business, running a bar for her boss, Nonomiya. She is quite blunt, and frequently teases her fellow party members. As she warms up to everyone, Saeko falls into a younger sister role within the group, though she is the most responsible, and will oftentimes scold their immaturity as a result. Saeko demonstrates her cunning in battle, utilizing her charm to leave enemies open for a brutal follow-up attack.
Despite running away from her family, she loves and cares deeply for her twin sister Nanoha. She keeps watch over Nanoha from afar, and intervenes when she believes that her sister's boyfriend is taking advantage of her for monetary gain.
Saeko spent much of her adult life away from her family after her mother passed away, as her relationship with her father and twin sister Nanoha Mukoda was tumultuous. She worked as a hostess in a bar owned by Nonomiya, eventually working her way to be mama of the place.
Yakuza: Like a Dragon: 2000-2019
Ichiban's first encounter with Saeko happened just outside Isezaki Ijincho's funeral home after Nonomiya's funeral, allegedly dying from hanging himself. Saeko overheard the team talking about him, who they thought to be diligent and delicate. She told them otherwise before she introduced herself and revealed that she's Nanoha's twin sister. Before the introduction, the team mistook her for Nanoha, and were surprised to see her lighting a cigarette and telling them how they "don't know her."
Saeko told the team that she discovered that her father was admitted to a yakuza-run nursing home from Nonomiya, which made her think that Nonomiya couldn't have committed suicide, but the cops treated his death as suicide. Just before his death Saeko was talking to him on the phone, and heard as people suddenly came into Otohime Land while repeating the name "Lao Ma", before she lost contact with him. The police ignored her testimony and breaks down asking for the trio's help. They accept her into the party.
The team then make their way to Chinatown, getting assaulted for trying to find the Liumang. They eventually head to a Chinese members-only hostess club, where Saeko offered herself to work at the club to help the team; she managed to get hired at the club as a VIP hostess, enabling the team to gain access and talk to Zheng. However, while in the VIP room, she gets harassed by Zheng (with him trying to lick her armpit) and runs out from the room, which prompts a fight between him and Kasuga's party. They learn that the Yokohama Trading Company can be their ticket to meeting Mabuchi, though Saeko is less than pleased at Zheng being let off. When they leave Chinatown and head back, Saeko notes how close the three men are. She intended to go her separate way, but Kasuga invites her back to their place.
Later on, Saeko and the team managed to find employment at a Liumang-owned business, the Yokohama Trading Company, where Saeko became employed as an accountant. Saeko discovered that the commodities are sold at break-even point, which makes her suspicious about the company's account book.
- Some of Saeko's skills in her default class are based on Boxercise, a real-life high-intensity training regimen based on boxing.
- In the earlier stages of the game, Saeko's name was originally Ayaka (アヤカ). This was hinted in the April Fools teaser for what was to become Yakuza: Like a Dragon.
- The given height of 170 cm (5′ 7″) is based on the character model's scaling factor within the game's data. For Dragon Engine games, this method is believed to be very accurate (±1 cm). However, this is intended as an estimate, not a substitute for an official statistic.
- Yakuza: Like a Dragon (Ryu ga Gotoku Studio, PC, November 2020) - .JSON File - "character_model_model_data.json"