Haruka Nijo

A second-year high school student. He's the guitarist and one of the vocalists of the band εpsilonΦ.

Always listless and cool. He does everything with apathy, but excels in studies, sports, and excels in performing with the guitar as well. However, he is a loner at school and has a complex towards his younger brother who is the polar opposite of him, of whom he hated very much. He is very prideful and gets hurt when his parents, or anyone around him, start comparing him to his brother. He is full of hatred and despondency due to his surroundings.

(Source: ARGONAVIS from BanG Dream! Wiki)