A first-year university student at the Faculty of Law. He could not forget the excitement of the outdoor life he witnessed as a child, and wished to stand on a big stage one day. However, since he is not good at communicating with other people, he would keep singing in the karaoke by himself, until one day his talent was found out by Yuuto, who was looking for a vocalist for Argonavis. He is usually calm but gets fired up when it comes to music.

A first-year university student at the Faculty of Literature. Born within a prestigious family in Hakodate, he immersed himself with music activities due to his inferiority complex towards his superior older brothers. He is strong-minded and optimistic, and does not doubt that he will one day become successful with his band and that his family will finally look at him. With his creed "we won’t know unless we try it", he created Argonavis with enough confidence.

A first-year university student at the Faculty of Literature. His father used to be a seafarer and his mother was always far from home, hence he has always been with his older brother since they were children. He started to become interested in bass because his brother was in a band. He is a prudent character who makes negative remarks to Yuuto, who tries to talk positively. However, he does that in order to make the band successful, by creating a good balance with Yuuto's positivity.

A first-year university student at the Faculty of Political Science and Economics. Being surrounded by study, sports, and music to the point that he could do anything, he is nicknamed "Shindou" (meaning child prodigy) by people around him. Above all, he hoped to be a baseball player, but got hurt before the Koshien (National High School Baseball Championship of Japan) and had to give up his baseball career. He doesn't show his real emotions but will respond to people who need him and try his best.

A first-year university student at the Faculty of Business. He wants to make a name for himself and earn money with the band to rebuild his parent's dairy farm that was hit with severe debts. From his experience of playing taiko (Japanese drum) when he was young, he showcased a powerful performance and sold himself to joining Argonavis. With a thorough rationalism and a personality that dislikes waste, he is constantly in high tension and a mood maker.