Mumei and IRyS were actively sick for long periods of time in ways that could have damaged their voices if they pushed themselves (Streaming would be awful for them). Mumei, especially. She actually probably came back too soon the first time around, if I had to guess, which probably is why she is taking a longer break this time.Mumei streamed a total of 375 hours this year and noone batted an eye because she's 3 times as hard working as gura!!!