Karasuno had gone to a training camp to get in some good practice, they’d been staying in a hotel, where basically everyone had their own rooms. It was the first day they arrived there, and Tsukishima and Yamaguchi went to explore the scenery around the area, since most of the team was unfamiliar with it. They took a small hike for funsies, just as friends would, and upon the dark hours of the night, found themselves peacefully sitting together under the stars in a meadow.