Thanks for the translation. There is a typesetting (idk if it's the right term) problem on page 17: "girl" should be next to "ordinary", otherwise it's hard to read.
Definitely not right what she did between Mizudori and her brother. shamelesss honestly. but it reminds me of actual idols and their parasocial fans. the crazy ones. but luckily it doesn't seem like that'll continue after this chapter. good on the author for wrapping it up in the same chapter. she might actually make a good friend for Mizudori now.