Gishi-san wa Mama ni Naritai

A young man finds himself in an unexpected situation when his older sister-in-law, who has always been kind to him, suddenly proposes a secret arrangement. She wants to become a mother, and she asks him to help her fulfill that desire. Caught between surprise and curiosity, he agrees to her unusual request.

As they navigate this taboo relationship, the boundaries of their family bond are tested. Their secret meetings grow more intense, blurring the lines between familial affection and forbidden passion. Both must confront the consequences of their actions and the true nature of their feelings.