[Machine Translation] The group's first best album to be released in conjunction with the graduation of "Chisato Kiyosato," who has served as the center of OS U for many years since the start of activities in August 2010. It will contain 20 songs in total (tentative) (*Some songs will be included only in the Chisato Chisato Memorial Version). Limited "Chisato Chisato Memorial Version" jacket (tentative).