Sawada Tsunayoshi's time stayed on that rainy day forever.
Concept: An accident separated two lovers forever, and the remaining party stubbornly believed that the accident was his or her own responsibility. This flood of pain overwhelmed him, and even made him feel that if he hadn't been with the other person in the first place, nothing would have happened. Since then, his time has always stayed on the day when the two were together. That was the starting point of everything and the moment he wanted to go back to most.