Roselia is an all-female band from Japan that was formed in 2016 as part of the BanG Dream! franchise. The band consists of five members, with Aiba Aina on vocals, Kudo Haruka on guitar, Nakashima Yuki on bass, Sakuragawa Megu on drums, and Shizaki Kanon on keyboard. Their music style is mainly rock and pop, with influences from J-pop, metal, and classical music.
The band's theme is centered around "darkness" and "emotion", which is reflected in their powerful lyrics and sound. Their music is mostly composed by members of Elements Garden, a group of composers and arrangers who specialize in creating music for anime and video games.
Roselia gained popularity in 2017 with their debut single "Black Shout", which was used as the opening theme for the BanG Dream! anime series. Since then, they have released multiple singles and albums, with their music regularly appearing on the Oricon music charts in Japan.
Apart from their music, Roselia is also known for their live performances, which feature intricate costumes and stage designs. They have performed at various music festivals and events, both in Japan and internationally, and have held solo concerts.
Due to their popularity, Roselia has made appearances in various media, including anime, manga, and video games. They have been featured in the BanG Dream! anime series, as well as in their spin-off anime, BanG Dream! Girls Band Party! Pico.
Overall, Roselia is recognized as one of the most successful all-female bands in Japan, known for their powerful music and emotional performances. Their music has gained popularity not only in Japan but also internationally, and they have become a beloved group within the Japanese music industry.