缘之空(ヨスガノソラ)是CUFFS社的新姐妹品牌"Sphere”于2008年12月5日发售于PC平台的一款成人向游戏(恋爱冒险类AVG)。2009年,又推出续作《悠之空》。《缘之空》以其清新的原画及冲击性的兄妹题材而吸引了广大玩家,成为日本的大人气萌系游戏(galgame)之一。由游戏改编的电视动画于2010年10月4日开始播放。另有改编漫画等作品。《缘之空》讲述了双亲因意外事故而丧生而变得无依无靠的主人公搬到无人居住的祖父的家中生活的故事。《缘之空》是一部旨在令人痛哭疾首(感人)又处于争议之中的作品,其兄妹主线更是成为一大争论焦点。远离都市的田园小镇,奥木染(おくこぞめ)。 缘之空春日野悠(かすがの はるか)带着妹妹穹(そら),来到了这座城镇。坐落在这里的是,儿时暑假经常造访的充满回忆的已故祖父的家。双亲因意外事故而丧生,变得无依无靠,因此主人公决定搬到如今无人居住的祖父的家中生活。一边和不习惯的家务苦战,一边还要照顾平时足不出户,什么事情都不会的妹妹穹,悠的生活变得异常艰辛。那样的悠,受到了曾经一同玩耍的邻家大姐姐依媛 奈绪(よりひめ なお)、刚转校便结识了的中里 亮平(なかざと りょうへい)、神社的巫女兼管理人天女目 瑛(あまつめ あきら)、以及她的朋友渚 一叶(みぎわ かずは)等人的热情欢迎。同儿时的印象几乎没有变化的村镇和人们,那让人怀念的回忆和温馨的环境,治愈着悠心中的伤痕。就在这样的过程中,慢慢地发生了一些变化。儿时所定下的只属于两个人的秘密的约定,以及所失去的重要东西的下落。还有,定下了这个地方的真正理由。作为回忆铭刻在心之时,也已经悄悄开始。面对伤痕累累,一路蹒跚走过的“她”,悠又会如何面对呢?阳光愈发灿烂的初夏的天空下,故事,就这样开始了。
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