Bump of Chicken's "Fighter" doesn't just score Rei's struggle, it is his struggle, every quiet moment of self-doubt compressed into four minutes of guitar that refuses to let you look away. The CGI moves like a heartbeat, sharp and urgent, matching a band that understands why a shogi prodigy's loneliness hits harder than any victory. This is what happens when two artists who genuinely love each other's work stop pretending collaboration is compromise.

A one-episode CGI music video pairs March comes in like a lion with "Fighter," a single by Bump of Chicken. The project came about through admiration running both ways: mangaka Umino Chika is a fan of the band, and the band's members are fans of her manga. The single was bundled with a special edition of the manga's tenth collected volume, which went on sale on November 28.