"Number one again this month, huh..." Miki smiled softly to herself as she looked over the sales department's monthly performance chart. 38 years old. A sales professional at a major corporation. Despite being married and having a family, she delivers results better than anyone else at work. Top sales performance again this month. "Miki-san, first place again! You're amazing." Every time her juniors called out to her, Miki would smile bashfully. "Well, I guess I worked a little harder this month." As a reward for Miki's hard work, the company organized a two-day, one-night employee trip. The destination was a historic hot spring inn nestled in the mountains. When the dinner banquet began, Miki, who was usually in work mode, completely relaxed. "No work talk today!" She laughed as she said it, emptying glass after glass as they were offered to her. Beer, sake, and then the cocktails she was encouraged to try. "Miki-san, you can really hold your liquor!" "Hmm? Not really..." With her cheeks flushed red, Miki laughed. Before she knew it, she had consumed an amount she would never normally drink. By the time the banquet ended, she was a little unsteady on her feet. "Are you okay?" "I-I'm fine... just drank a bit too much." Though she answered that way, her head was completely foggy. While being supported by her colleagues on the way back to her room, Miki looked out at the night view from the inn's window. Quiet mountains. White steam rising. And the sound of the river murmuring in the distance. "...It's nice to have this once in a while." Miki, who always stays at the top of her game at work. Who spends every day as a wife at home. But tonight, she was neither. She was enjoying the night at the hot spring inn as just a woman. And then—. The next morning, what awaited Miki was a small problem: her memory of the previous night was missing in patches. "...What... did I do yesterday?" Miki clutched her head under the futon. A two-day, one-night company trip. The first night had only just ended.