idk, they might re-release their single as a digital single and put Kana's solo on there... Or was this upcoming single already digital-only? Whatever, they can just do vice versa of whichever they originally announced, one with Rina solo and one with Kana solo.
I hate to say it, but I don't mind too much. Wada was one I was pretty torn up about just because her graduation feels like this big step in a new direction and the end of an "era." Seeing more 2ki go isn't surprising, especially since I feel they haven't been given anything stand-out in a few years. And I have to say it makes me hopeful 6ki and 7ki will really get a push forward. Murota and Rikako are amazing performers, so as long as 3ki stays solid for a while longer Angerme can be okay.
I just really hope they get a new wind in them, like Taiki Bansei originally was. And that they change up their choreo/formations a bit so they're not always walking to formation instead of dancing in spot, lol.