After graduating, the protagonist joins a black company and pledges to marry his girlfriend, Sakura, by next year. Their boss, Mr. Ozawa, treats the protagonist with particular harshness while showing little interest in other employees. As a result, the protagonist is constantly forced into overtime and suffers severe mental stress. Differences in how he's treated compared to others, along with tensions involving the department manager, lead to frequent arguments with Sakura. Still, they believe they understand each other's feelings. Amid the harsh realities of corporate life and the struggles of their relationship, a story of love, betrayal, and emotional conflict unfolds.