Likes: Fashion magazines, good fortune telling results Dislikes: Arguing and fighting, bad fortune telling results Koko is Yoshiyuki's childhood friend who is in love with him. But what prevents her to confess her feelings is just her own shyness. Using this trait of hers, her best friends Akane and Anzu love to tease Koko and try to make her look like a pervert. Koko is also a member of the band, along with Nanaka and Wataru. She can play the bass guitar, synthesizer and piano, and has even tried her hand at composing music.