The lead female character is living in an old apartment building on the edge of the city. Every time she goes out, no matter where she goes, she always goes left first. The lead male character is living in an old apartment building on outskirts of the city. Every time he goes out, no matter where he goes, he always goes right first. He never meets her. But the city is like a maze, it lets people see the same scene, go the same route.