You are Sukinosaurus

A mysterious girl and a strange ammonite I met at my new school. I want to dream of the Cretaceous Period with my "favorite" girl! The humble and passionate adolescence of me and her, who devote their high school life to excavating dinosaur fossils, begins!

Youth Romcom about a transfer student boy meeting a fossil fanatic girl in his new school who is introducing him to the paleontology club