The Ethics Teacher, Naofumi Hidaka, had built a peaceful home with his wife, Manami, a former actress who started her career in glamour modeling. However, five years into their marriage, Naofumi secretly received a diagnosis revealing that he was azoospermic—unable to produce sperm.

For Manami, who grew up in a single-parent household, creating a "happy family" was her way of repaying her mother’s sacrifices. Wanting to fulfill her dreams of motherhood and happiness, Naofumi begins to stoke the flames of his twisted "love," a love he keeps hidden deep within.

"I want to see the woman I love—not just as my wife, not just as a person, but as a woman."

Around this time, an opportunity arises: a nude photoshoot offered by the agency Manami worked with during her glamour modeling days.
This marks the beginning of Naofumi's warped love taking action. He exploits the cracks forming in Manami's ideal image of a perfect wife and family. Under the guise of understanding and mutual consent, he orchestrates situations where she is embraced by other men, men she doesn’t know.

All to protect their ideal family.
All to protect the one he loves.
Most of all, to love her more deeply than anyone else ever could.

[Translated from Official Site]