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QU4RTZ is a sub-unit under Love Live! Nijigasaki High School Idol Club.
The name QU4RTZ is pronounced as quartz, which represents the gemstone-like glamour of the four members.
QU4RTZ is composed with two third-year members and two first-year members. The third-years are like older sisters, while the first-years are like younger sisters in the group. Together, the group is like a family with four sisters.
Sing & Smile!! is the unit’s first single, which is released on 12 February, 2020. In the single, a song Sing & Smile!! and a C/W song Beautiful Moonlight is included.