RAW: https://e-hentai.org/g/3957579/fbf8068afc/

Author's note from the end of the book:
"I love charming girls who manipulate you so I had a ton of fun while writing this. I'll be pleased if you come to like Shinju-chan! Thank you very much!"

This feels like it needs an NTR tag, even if she was cheating and playing with him from the start.

Base +6

It was in a ntr report themed anthology, but it seemed like this author isn't really into that kind of thing. That part kinda felt phoned in, as well as the NTR. Not sure if it really fits the western definition.

Personally, I did like the insane evil woman correction. NTR report seems to work best in audio format and translating it without making it sound dumb is hard. Sanuki states he likes NTR report voice works in his author's note, and that seemed to fit the theme a lot better. I don't have the redrawing skills to try to TL that one though.

Base +6