The year is 1984. Teacher Amarida is crazy about school lunches, and he gets the shock of his life when school lunches are slated to be removed from the school. Amarida's student Kamino competes with him to see who can enjoy the school lunch more, and then Kamino declares that he will run for student council to bring about a school lunch revolution. New teacher Misono watches their drama unfold. Can Amarida protect the school lunches that he loves so much?

Teacher Amarida (Ichihara Hayato) has been transferred to a new school and is still crazy about school lunches. He gets the shock of his life when school lunches are made more healthy but less flavorful. Amarida’s student rival Kamino (Sato Taishi) has also transferred to the same school and is outraged at the changes to school lunches.

Set in the 1980s, Oishii Kyushoku: Road to Ikameshi follows Amari Yutaka (played by Hayato Ichihara), a passionate middle school teacher with an obsession for school lunches. His love for these meals is so intense that it leads to an ongoing light-hearted rivalry with one of his students, Ken Tsubura, who also takes immense pride in how he enjoys his lunch. The film centers around their comical "battle" to see who can savor their school lunch in the most delicious way possible. As the story unfolds in the city of Hakodate, the focus shifts to a local dish called ikameshi (stuffed squid), which becomes a pivotal point in their culinary competition.