A woman named Haru, who had been living together with her stepfather after losing her job until he found one, was supposed to be uneventful... but she unexpectedly finds herself being passionately desired by him. One day, he forces himself on her against her will, marking the beginning of their days filled with pleasure. What's more, her husband gets injured and ends up hospitalized... As her body develops and her mind changes, she apologizes repeatedly. Note that the contents may vary depending on the distribution method.