"White Line Flow" is a Japanese youth romance drama. The play tells the work and emotional stories that happened between several young people. High school is about to graduate, Okouchi is very busy, his ideal is to prepare to be an astronomy observer like his deceased father, but because his family is poor, what he has to consider now is whether he can afford to take the university exam, so he I have to work part-time during the day, and I can go to school to take part in night shifts at night. Yuanzi was born in a medical family, and her family had high demands on her. Every day, Yuanzi was overwhelmed by the burden of taking exams. Hase's father is the president of a bank with a wealthy family, and Hase's academic performance is very good. His ideal is to be admitted to Kyoto University. Hase likes Sonoko and has implicitly confessed to her several times, and wants Sonoko to be admitted to Kyoto University together in the future, but Sonoko only has Okouchi in his heart. Once, Dakouchi entered the school in a hurry from the outside, and bumped into Sonoko inadvertently. From then on, a beautiful love story full of youthful sadness began to be performed among the three young people