Kimi no Sei Nan Dakara, Sekinin Totte yo ne.

A woman works as an office employee and offers her services as a part-time rental girlfriend. She is skilled in social interactions and adaptable. While not currently seeking a romantic relationship, she envisions a future with marriage and children. She begins working with a client named Sui-chan, who is her first same-sex and younger client. Initially uncertain about the arrangement, she later realizes she is comfortable and capable of handling the relationship.