I am secretly trying to get pregnant with my brother-in-law who has the same play type as my husband. - Sannomiya Tsubaki

The movie revolves around Tsubaki, who is trying to get pregnant with her brother-in-law Yuki-chan, due to her husband Kouichi's fertility issues. The story explores the complex relationships and moral dilemmas that arise from this situation, as Tsubaki navigates her desires, loyalty, and sense of duty. The central dramatic tension lies in the secrecy and potential consequences of Tsubaki's actions, as she tries to balance her personal needs with the risks of discovery and the impact on her family.