An and Asuka have always held the belief that childhood friends cannot transition into lovers. They are well-acquainted with each other, aware of various little secrets, making the idea of becoming lovers seem quite odd. Marina Kirasaka, the blonde girl, often suffers from mistreatment at the hands of her neighbor's family due to family discord. Shizuka Kuze, a girl with black hair, faces bullying in her classroom. Aoyama and Nanami are striving hard on their own. The somewhat silly Anzu Hachimi often says, "Green plums cannot become lovers." This phrase echoed when these girls revealed their feelings to him. However, it appears that this belief is flawed. "Green plums can become lovers." Years later, with her body slim and her face aged, An and Asuka finally confessed to the girls, their legs shaking.