Recently, many studies have been conducted to deal with traditional Japanese music in music education based on re-recognition of its merits. Making students understand characteristics of traditional music and deepen their sensitivities to it enables students enrich their sensibilities about a variety of music. Additionally, it is necessary for students to understand culture as background knowledge of traditional music. Understanding culture leads to human education to deepen their senses of values in terms of wider perspectives in globalizing society. Therefore, this study aims to develop materials regarding Japanese harp with the following two viewpoints and investigate its effects on students. The first viewpoint is to develop a new unit to make students deepen their learning through interactions of children and students by interactions of different grades such as fourth and eighth grades in terms of educational continuity from primary through early secondary levels. The second viewpoint is to make students deepen their learning of Japanese harp by including creative activities based on their acquired fundamental music skills such as cognition and sensitivity to music elements.