Yukio "Koyuki" Tanaka is a fictional character from the manga and anime series Nana, created by Ai Yazawa. He is a talented guitarist and a member of the band Black Stones, known for his passion for music and his complex relationships with other characters. Koyuki's journey explores themes of love, friendship, and personal growth. In the series, Koyuki develops a close bond with Nana Osaki, the lead vocalist of Black Stones. His character is often portrayed as sensitive and introspective, navigating the challenges of the music industry while striving to find his own identity. Koyuki's story resonates with many fans for its emotional depth and relatability.