Yukimura and the others will be giving presentations at the summer study sessions. There's less than a month left until the training camp, but Kosuke still hasn't picked a research theme. Professor Ikeda suggests research into "an algorithm that could instantly find the True End in any dating game." On the other hand, Yukimura and Himuro are focused on the hormone which is released when a person is touched by someone they love - oxytocin. By investigating the amount present in a person's saliva, they think they might be able to determine if the person loves the one who touched them, and they decide to immediately put it to the test with some close contact...
As the two of them face their 
first night together...
...بينما يواجهان أوّل ليلة لهما رفقة بعض
Und als die beiden ihre erste Nacht
gemeinsam verbringen,
Con los dos pasando su primera
noche haciendo esto y aquello…
Con los dos pasando la primera
noche haciendo esto y aquello…
Durante la loro prima notte insieme, quei due
E durante a primeira noite
dos dois a sós...
Это их первая ночь вместе...