Wikipedia definition
1. Yosuga no SoraYosuga no Sora is a Japanese romance/drama adult visual novel developed by CUFFS ("Sphere"). The game was originally released for Windows PC on December 5, 2008. It was adapted into a serialized manga and a TV anime series. A sequel/fan disk titled Haruka na Sora was released later on October 24, 2009 which contains new and expanded scenarios for several characters from the original game.
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Read “ヨスガノソラ” on Japanese Wikipedia
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