Shachou ga Ani ni Narimashite

Azusa runs a small flower shop and delivers a plant to a company where she meets the president, Naoya. He is good-looking and kind, though he enjoys teasing her. He remains composed and patient with her despite her social awkwardness around men, which makes her find him appealing. She expects their paths to cross only once, but soon discovers that he will become her stepbrother. Their relationship develops further when they decide to live together.