A thrilling 3-night, 4-day journey with a stranger begins. Friends who have gotten boyfriends cancel their trip with Yujin. Yujin looks for someone to travel with online. Contrary to her initial impression of being plain and intellectual, Hyunju appears in a glamorous and sexy outfit, exuding a mature sisterly charm that seduces Yujin. Caught in the irresistible trap of Hyunju's seduction, Yujin struggles to keep her wits about her. In a moment of crisis, Hyunju accidentally calls Yujin 'senpai'?! "Did you just call me 'senpai'? What is your true identity?" The innocent older woman and the mischievous younger woman's counterattack!! "Hehe." Her laughter was annoying. The one who caused it is you, right? "Do you really have to wear such clothes? Can't you wear something more normal?" It was so embarrassing to even say it that I tried my best not to let my gaze wander in that direction as I continued speaking. "Ah... is it because of this? But I wore this thinking about myself, you know? Actually, I’m almost naked at home. Especially when I sleep, I sleep naked. Well, if you don’t mind, I can take it off."