Mayonaka no Stellarium is a Manga/Manhwa/Manhua in english language, Shoujo series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.cc fastest updating comic site. The Summary is

Kobayashi Aya has always dreamed about the amazing and bright youth she would have, entered in high school, but the truth is life is not a movie... or not?