The webpage “Official Video” is created to summarize videos of songs on various KOKIA’s official channels, official videos uploaded by companies that collaborated with KOKIA, etc. Trailer videos on the official channels of KOKIA are not summarized at this stage.
A summary of the collaboration works has been compiled as much as possible, though there are likely more videos that exist. Any information about videos, which do not pose copyright issues, would be appreciated if shared in the comments.