Marin, a beautiful high school girl dreaming of becoming an architect, accidentally shares her dream with her teacher, Ooki. Intrigued by her intellectual curiosity, Ooki takes her to a designer hotel on their way to school. As Marin explores the room, she unknowingly reveals her panties and cleavage, driving Ooki wild. Despite his fear of losing social credibility, Ooki succumbs to temptation. Tormented by guilt, Ooki gives in to Marin's desire to explore new worlds, and they have sex again.