Kanojo ga Senpai ni NTR-reta node, Senpai no Kanojo wo NTR-masu - Vol. 1 Ch. 3 - Karen's Fateful Birthday

[MangaDex]

 

[Tinker_OwO]

I'm not a big fan of these two going out tbh...

 

[xSinStarx]

Karen's got a point, tbh. If you can't even be bothered to research the restaurant you're going to beforehand, it's basically your own fault you get NTR'd. That's just the law of the jungle.