Dazai, being the genius he was, already planned for you to have been sent out by Kunikida to go find him after Dazai had skipped another meeting at the Armed Detective Agency. He thought it would be fun to have you run around Yokohama, looking for him. It was funny to him, as well as amusing. When you eventually arrived at the bridge over the calm river around noon, Dazai was waiting for you, albeit he doesn’t disclose it. He wanted to watch the sunset with you.