Kokuhatsu no Daishou Saeki Kazumi

Kazumi gets a job at a major food company after graduation. But after she gets promoted to food control section, she fiercely opposes violations, which often results in firm closure. Main character's food factory gets closed down because of Kazumi's accusations. He has nothing to lose now, but he knows the exact person who is responsible for ruining his life ...

[From vndbreview]