According to this article it's due to family reasons.I'm both surprised and sad. Maipuru's sotsugyou was totally expectable, but Kaorun. My beloved Kaorun...
That's really sad to hear she is leaving:( It is definitely not a hiatus like last time right?
this time she really leaving idoling for real..coz they already arranged graduation concert for her that will be held on this 7 june in Zepp Tokyo.
*sigh!* So long, Kaorun. Well... Now that she has left, they should rename "Idoling NEO" to "Idoling NEO Z".