Blast
Yasu, Nana, Noubu and Shin
Blackstones: Originally, Blast (short for Blackstones) consisted of Nana, Yasu, Noubo and Ren. However, Ren left the band to join Trapnest in tokyo as their guitarist. Shin is the second bassist to be in the band.
Nana: Nana is the singer and vocalist of Blast. After Ren left for Tokyo, Nana held onto the grudge of her ex.boyfriend and also came to tokyo to start something new. Nana is the inspiration core that inspires Blast to be so great. She is an amazing vocalist who apperantly had many fangirls back in her hometown.
Yasu: Yasu went to the same school as Naoki, REIRA, Takumi and Ren. He was the founder of Blast and original drummer. In the beginning of the manga, he helped NANA move into her appartment in Tokyo while he remained in their hometown to continue working as a lawyer (he is the only one of the bandmembers that went to college). He soon gives in to Nana and come to Tokyo to rejoin Blast, saying that "they will be law firms in Tokyo as well".
Noubu: Noubu is the guitarist of Blast. (He would only play the guitar, which is why Ren had to play the bass in Blast) Nuobu is the heir to his family inn, but he left for Tokyo after because he only wanted to play the guitar.