Secret Sigh (2015)

Your lack is my hope.

Yuriko, a woman who was severely hurt by love and gave up everything. When she wanders around a certain island, she meets Iwai, a strange man who rents a room at home for 500 yen a day. Yuriko, who decided to stay at Iwai's house, peeked at him that night because of his secret act of clinging to the love of the past. Yuriko becomes interested while mocking Iwai, and continues to live with him as if nothing had happened. All the while, spying on Iwai every night ...