1-4. Manatsu no Hanazono (真夏の花園, Midsummer Flower Garden)
Ryuu's parents won a 30-day cruise on a luxury liner, but they didn't want to leave him alone at home, so he will spend the time at his aunt's place. The woman is very attractive despite her age and her having two daughters, who too are beautiful and packed, so Ryuu is in for...