Futaro tries to urge Nino and Itsuki to stay at home to study, but ends in failure. Therefore, only Futaro and Yotsuba stay home, where Yotsuba subtly tells Futaro that she likes him. In the library, Ichika uses the handset photo which contains the fact that she has given Futaro a lap pillow to demand him to get all quintuplets' contact information. However, Futaro forgets to take his student handbook owning to the curiosity and care about Yotsuba's sudden leave, which is to decline the invitation of the school women's basketball team...