When Ume Aoki heard the news, she tweeted the following:

うまく言葉にできなくて書けなくてごめんなさい。今日中にはどうにか書きたいと思います。そろそろちゃんと仕事に戻らないとみゆたんにコラーって怒られちゃう。怒られたいな。

https://twitter.com/umeaoki/status/661328975893917697

ごめんなさい。全然まとまらないし言葉にすると全部違和感だらけなので当分書けなさそうです。

https://twitter.com/umeaoki/status/661529241293488128

In English, they read:

I'm sorry that I can't put my feelings into words. I hope to write something today. If I don't go back to work then Miyu-tan will be mad at me. I want her to get mad.

I'm sorry. It always feels out of place when I put it into words. I don't think I can write for the time being.