Day & Night
Sparks ignite whenever Day, a cheery person, comes into contact with Night, a stranger whose moods are noticeably worse. Both Day and Night are terrified and skeptical of one another when they first meet, and this causes them to get off to a bad start. However, as they get to know each other better and learn that they both provide a unique vantage point from which to see the same world, they begin to realize that their friendship is helping them both to develop a fresh point of view.