"Aoiharunohi", SETSU's 4th single. This is the first collaboration with a singer/Vsinger since the start of SETSU's activities. This song was born from the words of a school teacher who said, "Copyrights have become so strict in the field of education that there are no songs that can be used on the graduation DVDs that I give to my students. The song is available on SETSU's YouTube channel for use in graduation DVDs for school teachers to celebrate their students' graduation. The artists who participated in the song were carefully selected by SETSU. This graduation song features the voices of five unique individuals.