The official YouTube channel for singer-songwriter aiko has started streaming the music video for her new song "Anata no Hana no Iro" ( The Color of Your Flower ), which is featured as the opening theme for the fall 2026 TV anime Blue Box Season 2 . aiko "Anata no Hana no Iro" Music Video aiko made her major debut in 1988 and her well-known anime theme songs include "Itsu Aetara" (the opening theme song for Insomniacs After School ) and "Soushi Souai" (the theme song for Detective Conan: The Million-dollar Pentagram ). "Anata no Hana no Iro" will be included in her upcoming 17th album "Saigo ni Atsui Hibi wo Kuruwashiki Omoide" ( In the end, hot days with crazy emotion ), which will be available on October 21, 2026. She shared the following comment about the song on the anime's official website : In my student days, school and my room were everything to me. Laughing so hard with friends over nothing that my stomach almost cramped, or writing a strange letter to my crush at night only to re-read it the next day and throw it in the trash after all. Every single moment that I still remember remains a precious part of me, even now that I am an adult. This song became one that feels as if my past and present selves are together like that! It turned out to be a song where I was able to put those past feelings into words precisely because I have become an adult.