Among characteristic club activities in Japanese fisheries high schools, demonstration of dismantling tunas and other fishes dismantling is attractive to consumers as well as to students. In spite of the extracurricular education, the school has difficulties to provide enough chances the students to practice of the dismantling due to their cost. To improve the situation, this article proposes a virtual reality support system of self-study for tuna dismantling. The system provides visual sense through Head-Mounted-Display (HMD) with interactive manipulation of some kinds of knives by both hands. Through the experience of the virtual world, students can study correct procedure with safety and accuracy of the dismantling. From the user test for fisheries high school students, the system shows its effectiveness on the learning outcome of the dismantling.