Upon returning home for summer vacation, Touya is surprised to encounter four elegant women who have been employed as his live-in tutors. Rio, Nagisa, Amane, and Sara introduce themselves and outline their plans to enhance his education with personalized instruction. As the days unfold, their teaching methods prove to be unconventional, incorporating elements that foster both intellectual growth and intimate connections. Touya soon finds his summer filled with lessons that challenge his expectations in delightful ways.