The series primarily makes use of Vocaloids, a series of singing synthesizer software, and the songs created using these Vocaloids most notably the virtual-diva Vocaloid Hatsune Miku. The game is the first video game to utilize the Vocaloid software developed by the Yamaha Corporation.
Middle schools, or junior high schools, are schools that span grades 7, 8, and sometimes 5, 6 and 9, which straddle primary and secondary education. Upon arrival in middle school or junior high school, students begin to enroll in class schedules where they take classes from several teachers in a given day.
In Nigeria Grade 8 (JSS2) is the second to last year of Junior high, as there are no Middle Schools in the Nigerian education system, elementary school (primary school) ends in grade 6. Pupils (called learners by the Department of Education) are between the ages of 13 and 14.