Aww Kurumi...welp, that makes 3 out of 8 of the Oheso Solo Line members. We still have Nanami Murota Hamachan Kaede <3 and Rena.
I didn't mind Hirona leaving cause she hasn't spent THAT much time being a HaroKen but Kurumi did, and it's kinda sad to see people who've spent years just leave (well maybe not JUST leave, leave because they were done with it or found something else or both or other). Well, they're still young and since they were able to have experience having some sort of entry in show business then they can use their experiences and apply it in whatever else they do in life.
In the opposite case, there's now a ton of opportunities for debuting. There's the MM auditions, CM auditions, and with the "indefinite suspension" BK is getting, Tsunku might be more prone to make a new unit, though I guess you can say CM would already kinda fill the roll of being the 5th H!P group, I dont know
Kaede, you can do it!
^ Yeah it's kinda unfortunate...from what we've heard she's improved in singing a lot with her Suki-chan solo and that Ai no Sono performance she had with the other HaroKens.