A virgin is impregnated with a state-approved smartphone and should be a warrior. As part of measures to combat the global ultra-low birthrate, the government has officially decided to distribute "smartphones with an app" to men who can be impregnated on a trial basis. As a result, Nagata, a dull virgin student who finally got the privilege of holding the event for only one month. The first person he was matched with was Mitsuki Nagisa, a beautiful girl who had just transferred to a new school. She has a shadow somewhere, and for whatever reason, she is certainly a squirrel. Nagata, who does not know such a thing, believes that it will be an event as a matter of course, and approaches her and impregnates her in the name of the event ● . I didn't know at the time that my encounter with her was the beginning of a major incident later ...