Kasumi-chan was troubled by just one thing;
It regarded Kiyoshimo-chan.
Kiyoshimo-chan is not very responsible. Whenever Kasumi-chan is busy, Kiyoshimo-chan is always clinging onto her and acting spoiled. While Kasumi-chan is bothered by it, because Kiyoshimo-chan is so cute, she always gives in and spoils her.
"Hang on, I'm busy right now! Please don't get in the way, OK?", she would tenderly chide, but Kiyoshimo-chan would not listen.