The 10musume series (literally "10 girls") is designed to feel more personal and less staged than traditional studio productions.

: Their relationship is a long-standing "slow-burn" romance. While both have deep feelings for each other, Ippo’s shyness and her brother's intimidating presence often prevent them from moving forward.

| Detail | Information | |--------|-------------| | | Kyouka Mashiba (真柴 恭夏) | | Birthdate | March 14, 2003 | | Hometown | Osaka, Japan | | Position in the group | Lead vocalist & visual | | Specialties | Singing (pop & ballad), dancing (hip‑hop & contemporary), MC/hosting | | Personality traits (as shared in interviews) | Energetic, friendly, quick‑learner, “big‑hearted” with a strong sense of teamwork | | Social media presence | • Twitter: @kyouka_mashiba • Instagram: @kyouka_mashiba_official • YouTube: “Kyouka’s Corner” (vlogs, behind‑the‑scenes) | | Notable achievements | • First solo mini‑album “Starlight Echo” (released July 2024) • Won “Best Newcomer” at the 2025 Japan Idol Awards (shared with 10musume) • Featured in the “Tokyo Pop Festival” 2025 main stage performance |