The male lead and the female lead were high school classmates. For some reason, the male lead lived in the female lead's house. The two of them liked each other.

The female protagonist might gradually discover the similarities and interests between them while the male protagonist lived in her house, thus establishing a relationship. It was also possible that after the male protagonist left, the female protagonist missed the time they spent together and developed feelings for the male protagonist. In any case, the female protagonist might have developed a dependence on the male protagonist or an emotional dependence that she could not leave the male protagonist.