There probably won't be a full story, but I'll leave a rough description.
Misaki is pregnant, at first Takumi slightly suspects her of cheating, but does not show it, because he believes her, but the tests say otherwise. After visiting the hospital, they learn a very unpleasant diagnosis-a false pregnancy. A complex mental and physiological disease that is difficult to treat. They will have to overcome this together, because they still go to school, and many do not know that Misaki is ill...
The condition, which in medicine is called false pregnancy, refers to the psychophysical disorders of the female body. This phenomenon is quite rare, and its features are extremely poorly studied in modern medicine. A false or imaginary pregnancy is a psychophysical disorder that is characterized by erroneous beliefs about the onset of pregnancy in the presence of all the characteristic symptoms and signs of an ordinary pregnancy.