高嶺のなでしこ's ' "Koi o Shitta Sekai" was released on its scheduled release date, December 17, 2025. With this song being around four minutes long, at 4:15, the duration of this song is pretty average compared to other songs. This track is safe for children and doesn't appear to contain any foul language, since the "Explicit" tag was not present in this track.