The 4th installment of the hugely popular project! The 'New Population Decline Law' is being implemented, which analyzes the genetic information of the nation and notifies the best marriage partner. This time, the partner is Shuri-chan, who works at the library. She has a slender figure and double eyelids. But she's also very shy. Her shy personality is also very cute. Shivering while holding hands and kissing. That's the first time for her to have sex!