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when 1st wave first debuted rin figured it'd be hard to follow 8 vtubers at once, so she formed the sub-unit jk gumi and they held their first stream around valentine's 2018. since then it's been a yearly tradition for them to collab on valentine's. Aside from them they're also called to a lot of events as one of the most senior units, or went to trips together (i.e. hawaii)
