Yoshito Morozumi is a school friend of Maho Minami and a budding actor and model. He is deeply interested in Maho and competes with Koyuki Tanaka for her affection, often subjecting Koyuki to ridicule because he views him as an ordinary person who does not deserve Maho's attention. Motivated by his desire to win Maho over, Yoshito uses his connections in the entertainment industry to help Maho establish relationships with television representatives. His role in the story is primarily that of a rival to Koyuki, creating tension in Koyuki and Maho's relationship. Later, he joins the band Belle Ame on stage during the Greatful Sound festival, showcasing his ability to perform in front of large audiences. His background as a famous young actor gives him confidence and a sense of superiority, and he remains dismissive of Koyuki throughout his appearances.

Manabu Miyazawa, sometimes referred to as Manabu, is the vocalist of the band Belle Ame. He is recruited by Eiji, the guitarist of Belle Ame, after being spotted during a baseball game. Ryusuke Minami originally considered inviting Manabu to join Beck in order to persuade bassist Taira to commit to Beck instead of Eiji's band, but Manabu is convinced by Eiji and instead becomes the frontman of Belle Ame. He actively tries to recruit Taira by interrupting a Beck show to perform with his own band, demonstrating his persuasive and competitive nature. Manabu is a skilled singer and plays a key role in Belle Ame's rise as a popular band, though critical reception of their music is mixed. His motivation is tied to his band's success and rivalry with Beck.