A virgin is impregnated with a state-approved smartphone, but it should be unrivaled.As part of the global measures against the ultra-low birthrate, the government has officially decided to distribute "smartphones with event apps" to men who can be impregnated, which was being experimentally promoted.With this, Nagata, a dull virgin student who finally got the long-awaited one-month event privilege.The first time he matches him is Mitsuki Nagisa, a beautiful girl who has just recently transferred to another school.Somehow she has a shadow, and it is certain that her reason is a secret.Nagata, who doesn't know that, naturally believes that her event will take place, so he approaches her and impregnates her under the name of her event.At that time, he had no idea that his encounter with her was the catalyst for the beginning of a major incident later on...