Kono Ai wa Tsumi desu ka?

Umi, a newly promoted desk editor at a major publisher, seems content with her career and her relationship with Daichi, her boyfriend since college. For work inspiration, she casually orders an AI love doll, customized to match her preferences. As soon as she places the order, a young man named Sora appears at her door, claiming he has come to comfort her. He looks exactly like the doll she designed, yet so convincingly human that Umi is wary of him. Soon afterward, Daichi abruptly ends their relationship, leaving Umi deeply hurt. Sora gently embraces her as she struggles with the pain, offering comfort to both her heart and body. Umi begins to spend blissful days with the ideal lover made just for her, and wonders whether this happiness is a sin.