高坂唯

Yui Kousaka — Born in 2001, from Chikuma City, Nagano Prefecture.

During high school, she was a member of the light music club, captivating many students with her guitar and singing. Luna first saw her in the school hallway — Yui’s hair swaying gently in the breeze as she played and sang. In that fleeting moment, Luna’s heart was captured. Before long, the two became more than senior and junior — they became lovers.

On weekends, Yui would visit Luna’s family inn, Tsukimikan, helping out while the two spent quiet, happy days together. For Luna, Yui was both her first love and the person who opened her heart to the joy of music.

After graduation, Yui pursued early childhood education at Matsumoto Junior College, driven by her love for children, while continuing her passion for music. Her dream was to move to Tokyo and build a life that combined both education and art. Hearing this, Luna made a silent vow — one day, she too would go to Tokyo and stand by Yui’s side.

Yui left for Tokyo first, becoming a kindergarten teacher. But as the months passed, her messages grew fewer — until they stopped entirely. All that remained was a promise: “Let’s play music together in Tokyo someday.”With that promise in her heart and Yui’s old guitar in her hands, Luna set off for Tokyo.