Green plums cannot become lovers.

An and Asuka always believed that childhood friends could not become lovers. After all, they knew each other so well and knew many of each other's little secrets; it would be too strange for them to become lovers.
Marina Kirasaka, a blonde girl who is frequently abused by her neighbor's family due to discord.
Shizuka Kuze, a black-haired girl who was bullied in class.
Aoyama and Nanami, working hard all by themselves.
The somewhat goofy Anzu Hachimi
My distant cousin
"Green plums cannot become lovers."
So, this is what he said when these girls confessed their feelings to him.
But it doesn't seem to work.
"Green plums can become lovers."
Years later, with her body thin and her face withered, An and Asuka finally admitted to the girls, their legs trembling.