tripleS makes its Japan debut with a single! The eight members were selected as the unit "tripleS Hacchi": S3 Ji Woo, S4 Chae-yeon, S5 Yoo-yeon, S6 Soo-Min, S11 Kotone, S16 Mayu, S20 Sion, and S21 Chae-won. The limited edition type B includes a Blu-ray with a music video for "Untitled" and behind the scenes, a Double Class Objekt type-A randomly selected from eight kinds, and a flyer with an application code (valid only in Japan).