Not Secured, Loose Ends, previously recognized as Yukueshirezutsurezure (ゆくえしれずつれづれ), is an idol ensemble that made its debut in November 2015 and disbanded on January 2, 2021, only to be revitalized in September 2023 under their English designation. The group is distinguished by its “Exhaustion-Passion” theme, delving into intricate and paradoxical concepts such as existential voids juxtaposed with fulfillment, the interplay of light and shadow, and the complexities of despair and joy. Musically, they fuse catchy pop melodies with death rock rhythms, producing a unique and compelling genre-blending sound that captivates listeners.