Starry☆Sky 

Manga featuring characters from the otome game Starry☆Sky. Tsukiko Yahisa is a college student majoring in astronomy. One day a single e-mail brings memories of the good old days at Seigatsu Academy. All those friends she made throughout the year, now scattered - she wonders what happened to Yoh, Tsubasa, and Ryunosuke, and hopes they find each other and hang out like they used to once again.