Sakamoto's Family Secret!.Finally getting some free time, Toru and Yuujirou start with their summer homework. But they find some problems difficult to solve and so decide to go to Sakamoto's house to ask him for help (Sakamoto had invited them over earlier). they are also hopeful of meeting the famous older "Sakamoto-sama". When they finally arrive, Sakamoto warns them not to get too surprised by what they see, but Toru and Yuujirou convince him, that as princesses they are used to almost all surprises...