Ten years ago, Nagisa lost her husband and has since raised her son Shoichi alone. Shoichi was a mama's boy who grew up pampered, and until middle school, he would touch her breasts and bathe with her. When Shoichi entered high school, he began to feel shy, and while Nagisa optimistically accepted her son's transition into adulthood, she simultaneously felt loneliness. Her relationship with Shoichi was a mix of maternal bond and romantic-like, special emotions. While wishing for Shoichi's growth, Nagisa also sought to fill the emptiness in her heart.