Nagisa Sawa emerged from a conservative, controlling family, beginning his career as a policeman. A profound personal shift followed the murder of his sister by her husband, an event witnessed by his young cousin, Yukihito Sawa. Stepping away from law enforcement, he embraced cross-dressing and forged new paths as a novelist and filmmaker.

He authored the novel "Embracing Love" and later directed its film adaptation, casting Iwaki Kyousuke and Katou Youji in the lead roles. Sawa often drew creative inspiration directly from life, famously incorporating a verbatim conversation with Katou about his feelings for Iwaki into his work, causing significant tension.

Following his sister's death, Sawa became the primary caregiver for the traumatized Yukihito, rendered mute by witnessing his mother's murder. Their relationship gradually evolved from guardian and ward into romantic partners. Sawa formally adopted Yukihito, establishing their familial and legal bond while maintaining a sexual relationship with him.

Within the narrative, Sawa frequently interacts with Iwaki and Katou, both professionally during film projects like the production of "Winter Cicada" and personally. His presence often bridges the main storyline with various subplots. His cross-dressing and unconventional relationship occasionally provoke surprise, exemplified when Iwaki initially mistook him for a woman.