Rainy.'s second album release! This album includes 11 songs: ten tracks released in the two and a half years since the first album in June 2023, plus a new song written for this release. Seven of the songs are tie-up works created through various collaborations between Rainy. and drama, games, sports, manga, anime, and magazines. By producing songs tailored to each collaboration, Rainy. has continually challenged and discovered new aspects as a singer and performer. This important second album was created together with everyone involved in the songs. The new song "Rainbow," themed around Rainy. and Sunny. (the name of her fans), is a medium-tempo number with lyrics written by Rainy. with her staff to express gratitude to Sunny. Included in the Limited Edition are a DVD featuring three live performances from a private concert held for associates in August 2025 and a 28-page photo booklet. The live performance, prepared entirely during the summer vacation of her second year in high school, is a must-see.