Highly acclaimed! The fourth installment in the series where sex is integrated into daily life! This time, female high school students are having sex during their school trip. Even when being vigorously penetrated by a hard cock, they completely ignore the penis! In situations where they absolutely cannot make a sound, such as inside the bus, in the inn's courtyard while the landlady greets them, and during the priest's sermon, they 'constantly have sex' as the school trip progresses to climax. For the first time in the series, they have sex naked while bathing!
