VTuber Fact

 Japan's idol industry uses the term "graduating" when a member of a group is leaving for undisclosed reasons, usually due to controversies or from growing too old to remain popular. Likewise, farewell concerts are known as "graduation ceremonies". Virtual Youtuber companies such as hololive and Nijisanji also employ the same terminology as both industries share a lot when it comes to terms and guidelines their members should follow, jokes about vtubers's behavior being as un-idol like as possible notwithstanding.