Hoshizora no Memoria story begins with the protagonist, Kogasaka You, moving back to his hometown, which he left behind several years ago. Upon arriving, he stumbles into an abandoned, sealed observatory, whereupon he encounters a mysterious girl who looks exactly like his childhood friend did years ago. She introduces herself as Mare, a shinigami who reaps nightmares.
Meanwhile, back at school, You ends up joining the astronomy club, which is desperate need of new members. At night, he continues to visit Mare at the observatory, all the while trying to remember a certain someone’s name…
Kogasaka You encounters Mare, a shinigami who looks just like his once separated childhood friend. Hoshizora no Memoria is a game about students overcoming their past, their nightmares.
Hoshizora no Memoria Full English