Hey, let's go to the “deepest part of the world” together! Rui Sajima, a high school student in Tokyo, felt vaguely uncomfortable at school and at home. The only place where she can calm her mind is a pedestrian bridge in the middle of the night. There, he meets Ryouma Unoki, who has transferred to the same school. When I talked with him, I felt strangely relieved of the suffocating feeling. Perhaps it was because he felt the same suffocation. “I want to see the deepest part of the world”, he said, and his words were easy to understand. If the two of them could stay together like this, the gray, boring world would not be so bad, he thought. But that all changed one day when Ryouma picked up a gun. “Hey, Ryouma, let's go look for the deepest part of the world together”. (Source: Kadokawa, translated)