Chiho Ishida is a Japanese idol, singer, model, and presenter, represented by Twin Planet. She is a member of the girl group STU48. She is the first member of the group to hold a solo concert and release a photo book, and has thrice been the lead performer of the title songs of the group's singles.

Yumiko Takino is a Japanese tarento, model, presenter, actress and former idol singer. She was a member of STU48 and the lead performer for the title songs in the group's first five singles, and is also known for her saxophone playing.