song is otahen anthem aka otahen アンセム from the game idolm@ster sung by riamu yumemi who is voiced by seena hoshiki. I'm not making any money from this or claiming to own the song!! i just made this for fun and because I can't find the full version subbed on youtube!!!

bits of it are my own translation; i referenced    • [Deresute MV] OTAHEN Anthem (Riamu 1s...   and https://lyricstranslate.com/en/otahen... for some parts. if either of those people want me to take this down for that reason, i will. also, I'm not fluent in jp yet so there are likely some mistakes. sorry about that and feel free to correct anything i messed up :3