Google Translate can barely parse that box but the gist I got was she sold breast milk that occurred from a failed experiment
Wh-...you're saying you wanna buy more?Wellll...the supplier is...it's just, well, I-I dunno...Nitori worried that if she thinks of selling the milk that came out from a failed experiment to humans, then they are going to be regular customers.You said that milk from the other day was super tasty?Er, uh...thanks, I guess.