Satsuki was engaged to Yuji Mikage's brother before his pre-story death. She now co-manages the store with Yuji, continuing the business linked to her late fiancé. This shared enterprise necessitates their close daily proximity.

She becomes the central object of Yuji's romantic and sexual desires, dominating his thoughts and dreams. This creates significant emotional conflict due to her prior relationship with his brother. Yuji grapples with his feelings while Satsuki remains emotionally connected to her deceased fiancé, establishing a complex tension between them.

Her role involves managing the store alongside Yuji. Specific details about her responsibilities or personal background beyond her connection to the brothers are not elaborated. She exists primarily as a central figure in the love triangle involving Yuji and their coworker Miki, who harbors feelings for Yuji.

The narrative confines her portrayal to the context of the single original OVA, focusing on the tensions arising from Yuji's infatuation and her status as his late brother's partner. No significant character development, changes in relationships, personal growth, or expanded backstory exists across other official media.