That Blue Summer Vol. 3 (Kodansha, 2020)

Rio's a temporarily displaced Tokyoite destined for the big city once summer's over, and Ginzo's a country boy, through and through. Even though Ginzo turned down her advances once before, Rio can't help but notice that he still treats her as someone special. But just as things start looking up for our heart-struck heroine, trouble comes charging in on a train straight out of Tokyo!