Kimi wa Mendou na Konyakusha (Season 1)

Shino Kagiya, the daughter of a confectionery company president, is engaged to the perfect fiancé, Tachibana Hajime, but after three years, their relationship remains stagnant. When a new employee, Yui Hanazawa, joins the Sales department and grows close to Tachibana, Shino begins to question her feelings and the future of her engagement.