On June 17th and 18th, we visited to Ichinazaka Elementary School and Ono Elementary School and held PET bottle rocket seminar for the sixth grade of the elementary school. After Prof. Maruyama's lecture about rocketing science, we helped the students to make their own PET bottle rockets. Using many vinyl tape, they made the colorful rockets. Next, in the schoolyard, we lunched the rockets into the sky raising a spray of water with cheers of the students. After lunching, we held the small awarding ceremony and received the appreciative words by the students. Finally, we took a commemorative photo with the people concerned. In June 18th Kahoku Shimpo and on the website of Ichinazaka Elementary School, there are the articles about this seminar.