Beautiful, mysterious ramen-loving Koizumi-san (Hayami Akari) begins to eat a bowl of ramen heartily like always. Meanwhile, Koizumi-san’s classmates Osawa Yu (Miyama Karen) and Nakamura Misa (Furuhata Seika) and committee chairperson Takahashi Jun (Tanaka Mirei) have lost sight of her even though they came to the Shin Yokohama Ramen Museum. The three of them are searching around for her when a foreigner suddenly speaks to them in German, which none of them understand. Just as they are in a bind, Koizumi-san briskly shows up. After that, the four of them head inside the Ramen Museum to eat at Ramen Muku Zweite, a ramen shop with its main branch in Frankfurt, Germany. All of them are surprised by the ramen’s appearance which is completely different from what they had imagined and Koizumi-san’s extensive knowledge of ramen bursts. One week later, Misa is surrounded by a large crowd of people because of a video that she had put on Youtube. This video about “cute high school girls trying to eat ramen” had recorded an impressive number of views and become the topic of conversation due to its surprising content. The video is the start of Misa going out of control. Koizumi-san, Yu and Jun get caught up in it and things head in an unexpected direction.