Hoshizora no Memoria
Release date: Mar 27, 2009
Summary: The 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.
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Note: No installation required