Mitsuo is the drummer in the band Echo. Mitsuo grew up raised by his mother, his father died when Mitsuo was a child. The family lived in poverty and the boy knew all the difficulties of poverty. In his teens, Mitsuo met Akira, who was wealthy, from a loving family and generally a popular person. With age, Mitsuo and Akira became best friends, but envy began to appear in Mitsuo's heart towards his friend, which he tried to suppress.

Katsu is the guitarist of the band "Echo", a green-eyed blond, bright, edged, emotional, the main ray of sunshine in the band.

Sora is the bassist in the band "Echo", red hair, green eyes, cunning, sly, calculating, runs the band's affairs together with Akira.

Akira is Mitsuo's best friend and the lead singer of the band Echo. Proud, arrogant and noisy. Akira has black hair and brown eyes.