Starry Sky Vol. 1 (manga)

College student Tsukiko Yahisa is studying astonomy when a solitary e-mail brings memories of the good old days at Seigatsu Academy back into focus. Her mind wanders back to the scattered friends she made that spring, summer, fall and winter, and she finds herself longing for Yoh, Tsubasa, Ryunosuke and the others once again... Based on the hit Japanese game series!