Remember on Izu's Birrthday, Miyabi asked them not to graduate.... Miyabi loves holostars so much he cant bear to see his genmates leave but since he cant do activities with them as a group anymore, he really cant continue his own individual activity. It's too cruel to continue..
Y’know. Some years ago, I think it was Temma who said that if Miyabi decided to graduate/get fired, he would leave right with him. He declared he wasn’t going to be in Holostars without Miyabi in that sense.
And now they’re graduating on the same day. He really stuck to his word