Name: Shiho Hinomori Shizuku's younger sister. First person: I (private, blunt) Address terms: Shizuku -> Big Sis (Onee-chan) An -> Shiraishi-san Kanade -> Kanade-san A member of YUME YUME JUMP! She is stoic about music and a lone wolf who dislikes unnecessary socializing. Because of this, she is often misunderstood, but after seeing Shizuku and the others work hard toward their dreams, she begins to want to pursue those dreams with them. While she often acts blunt, she cares about her fellow dream-chasers more than anyone. She was invited by Shizuku to "try being an idol together" and was initially quite reluctant. She tried to decline, saying she wasn't suited for it, but after seeing Shizuku's genuine passion, she joined, thinking, "If my sister wants to do it that badly, I guess I can tag along for a bit." However, she personally intends for this to be a "temporary participation."

Name: Shizuku Hinomori Shiho's older sister. First person: I (polite, feminine) Address terms: Shiho -> Shi-chan An -> An-chan Kanade -> Kanade-chan A former idol who once served as the center for the popular idol group "Cheerful Days." Utilizing her experience as an idol, she serves as the central figure who keeps the members of YUME YUME JUMP! together. She values chasing dreams as a group rather than alone, and aims for a new stage alongside Shiho, An, and Kanade.

Name: An Shiraishi First person: I (cheerful, casual) With a bright and straightforward personality, she is the mood maker of YUME YUME JUMP! She performs with the dream of making everyone smile on a big stage. At first, she was hesitant about working as an idol, but after meeting Shizuku, Shiho, and Kanade, she learns the joy of chasing dreams with friends. Leading the members with her natural brightness and drive, she aims to one day create the ultimate stage with everyone. Address terms: Shiho -> Hinomori-san Shizuku -> Shizuku-san Kanade -> Yoisaki-san Reason for joining: She wanted to challenge herself on a new stage. She joined after being invited by Shizuku. At first, she had a lighthearted "sounds fun!" attitude, but as they progressed, she began to feel that she wanted to create a stage that only the four of them could achieve. An herself also found the idea of "chasing a dream with someone" very appealing and became an active participant.

Name: Kanade Yoisaki First person: I (quiet, polite) Shiho -> Hinomori-san Shizuku -> Hinomori's older sister An -> Shiraishi-san The composer for YUME YUME JUMP! Since they decided to stand on stage together, she has been writing music to turn the dreams and feelings of the four of them into sound. Initially, she was bewildered by the idea of being on stage herself, but through her activities with Shizuku and the others, she discovers the joy of not just making music, but chasing a dream together. Though usually reserved, her passion for music is strong, and she works hard to create the best stage for her friends. Reason for joining: She wanted to write songs for Shizuku and the others. She joined as the composer after Shizuku asked her to "write a song for Yume-Jump." At first, she thought, "I don't need to be on stage, I'll just write the music," but Shizuku and the others invited her, saying, "Kanade, you should stand on stage with us too." Thinking, "If I'm making music for everyone to fulfill their dreams, I want to witness those dreams firsthand," she decided to perform on stage as well. She started behind the scenes, but as she shared the dream with her friends, she stepped out onto the stage herself.