The start of their relationships occurred in the engineering department. It's uncertain whether their connection will grow stronger or if they will become incompatible as time goes on. However, since everyone grows, change is inevitable. What will happen when a gruff person tries to act cute? What will happen when a gloomy person becomes cheerful? What will happen when a person who is friendly to everyone in the world feels sad? Whether those changes are good or bad... they all happen because they still 'love' each other.