Black Joushi wa Tenseisha!?

One day, Fumiya Saito, an ordinary office worker, encounters his cool, beautiful, and perfect boss, Tamaki Kamikawa, at the station. However, she seems to be acting strangely, and as a train approaches the platform, her body sways unsteadily and she falls toward the tracks. Consumed by despair at having failed to save Tamaki, he goes to work the following week. Far from being criticized, he is instead hailed as a hero who saved her. Baffled by the situation, he goes to visit her in the hospital as he was told, only to find her completely unharmed...!? And then the story takes a whirlwind turn!?