The other comment is slighty wrong. They are considered "problematic" because their works often have sexual assault. If "Nii-chan" is pedophilic or not is debatable. They show a teen having sex with an adult, but never tried to normalize it and also treat about the psychology of csa victims. In my opinion It's weird, considering in another work ,called "one room one angel", they implied a romantic feeling between a grown man and a middle schooler.

Genuinely asking, what’s wrong with the author Harada? I don’t know about their other works