The situation of Final Approach involves an experimental government operation ("R.T.P.") to oppose the declining birthrates of Japan, circa this period in time. The primary decision was to arrange a national project in which young citizens of opposite sexes are to be paired together in marriage, and therefore in parenthood. While the economical and political gains are great, the social and emotional aspects of the "subjects" in the project are easily assumed adamant in defending the previous method of marriage. Thus, the Japanese government decided to test the project on an experimental level, i.e. with one couple at a time. The Mizuhara siblings are the first to be chosen for the R.T.P. project. The brother and the sister, Ryo and Akane, have long been living together in the same apartment. Still in public school, the two have endured a difficult life after their parents' death some years back. Ryo, the main protagonist, has assured to himself that all is well; he and his sister are living on well-paid wages, and he only needs his sister. The vision of his future is soon to be shattered by the R.T.P. when his planned fiancée, Shizuka, enters his apartment one night with several government bodyguards. By some preliminary actions taken by the government (as precautions), Ryo is forced to house his new wife-to-be, despite his refusal. [From [url=http://en.wikipedia.org/wiki/Final_Approach_(visual_novel)]Wikipedia[/url]]

本作为一款由之前曾经担任人气作《混沌头脑》角色设计的“ささきむつみ”担任人设，《Final Approach》系列编剧三浦洋晃负责剧本的恋爱文字游戏，游戏中将会以现代世界为舞台，描述由人类与人鱼产下的主角"一生一次的恋爱"故事。同时游戏更邀请日本人气同人歌姬“片雾烈火”负责演唱本作片头片尾曲。 本作系统使用一般正统文章阅读选择式的文字游戏形式来进行。由于本作主题是“一生一次的恋爱”，因此在游戏中采用了所谓的only once游戏系统，当玩家在跟女主角分歧的重要选择中，将会有许多困扰玩家判断的陷阱存在。而且玩家最早攻略过关的女主角将会成为游戏中的主要女主角，游戏也将会在玩家攻略这名主要女主角后得到相应的附加内容和后续额外的剧情。 在本作故事方面，描述拥有人类父亲与人鱼母亲，过着普通人生活的高中生主角高梨翔司，突然面临人生重大的变化。那就是由于父亲的死亡，使得主角得知母亲为了以人类身份存活在这个世间而施展，让人类跟人鱼可以互相结合的魔法正逐渐失效中。因此主角如果不能尽快找到自己的另一半，接受人鱼的祝福(魔法)的话，就会变回人鱼，甚至变成泡沫消失。虽然主角目前还只是个高中生，还不用那么早就找出自己的结婚对象，不过对对方来说，要跟身为人鱼后裔的主角结婚，却必须要有很大的觉悟的决定才行…。而究竟，主角是否真能找出自己一生一次的恋情，改变自己的命运!?