Agnese lives in an isolated house in the middle of the hills. She cultivates her garden in the sunlight and lives a quiet life of routine in the company of a mysterious guest she keeps locked in a room in the darkness of her house.

立花海咲（仓科加奈 饰）是来自天草、如今活跃于时尚摄影界的顶级摄影师，深受意大利顶级设计师的信赖。然而，最近她因视力下降感到困扰。原本有轻度色弱的她，在大学医院接受检查后，得知自己患上了一种可能影响摄影事业的疾病。疲惫不堪的海咲收到妹妹的来信，决定回到18年未曾踏足的故乡天草。在那里，她遇到了自己一直厌恶的继父多一郎（渡…