A high school welcomes a new student. Although the girl with a beautiful face but rustic, Ribino Tsubaki (Takei Saki) was snatched away by the first-place handsome boy Chun Jingtai (Matsuzaka Tori) on the day of the school opening ceremony. With this as a starting point, Jingtai treats Ribino as an object of teasing, and never tires of it. Although he hates this handsome boy with frivolous behavior, Ribino's heart is quietly changing. The old-fashioned and traditional girl is in love, and she tastes the sweetness of youth and first love. At the same time, Jingtai's feelings for Ribino are also changing. On that seemingly extremely romantic Valentine's Day night, looking up at the starry observatory, Ribino mustered up the courage to confess to Jingtai, who knew that their relationship took a sharp turn for the worse... This film is adapted from the original work of the same name by the cartoonist Mizubo Fengnan.