let me guess... Shiratsuyu having a stomachache after finding out how much trouble her sister caused?

• 2nd: post #3419603 & post #3421418 "My sincerest apologies for the trouble"
• 3rd: post #3559725 & post #3561988 "I offer my utmost apologies for my sister's misdeeds"
• 4th: post #3362921 "B-B-B-B-Be careful from now on, got it?"
• 5th: post #3600865 "Don't get ahead of yourself"
• 6th: post #3356795 "I would like to have a word with you after this"
• 7th: post #3470445 "Kagerou! Take your sisters and run, now!"
• 8th: post #3513881 "Huh!? N-no!"
• 9th: post #3397975 (The elder sister you couldn't brush off that easily has come)
• 10th: post #3662189 ("Shiratsuyu, you should apologize too...")

[Stomachache intensifies]

The unprompted "I am Ooshio!" has become the series' own "Yes, I am Kazuma."