The protagonist doesn't stand out in the educational institution either, the friend are feq and doesn't have her either, student who spends very common every day. Elder sister Mitsuki on the contrary, It is active sociable and the friend many, there is a boyfriend too and a lively student life is spent. It can not become elder sister's way, it can do nothing but live quietly as it is... Protagonist who gave up. It was an encounter with one woman to have changed such days.
[Nice to meet you, study will be taught to the elder sister it is said Moriuchi Honoka]
(...Tsu!)
Woman Honoka of older that came as tutorial of elder sister. It overflows in the broad-mindedness, to the woman who calm with a smile the protagonist has fallen in love glancing. Since then, the thought of Honoka, the ecchi with her is delusions, every day when it keeps comforting me continues. After all the delusion. It never becomes the reality.
However the unexpected event wakes up. Do her in the “Okazu" the masturbation scene, it has been witnessed by chance by Honoka person in question. Protagonist to which it is in a hurry and it is puzzled... However Honoka is not angry and far from despising, be gently with a smile.
[In this way, I wanted you to do it?]
(E, Ee!?)
Let me make use by stroking with the hand. To the protagonist who is stunned for an unexpected situation, in addition Honoka.
[Do not be worried when she can do, it teaches variously]
It whispered sweetly. A secret "Private class" by Honoka begins in this way. The Protagonist who a delusion becomes the reality, which her indecent guidance is received by dreaminess.
Thing one day, the elder sister Mitsuki encounter the "Lesson" scene of two.
[Wa, Wa, What is done!?]
It was Mitsuki at a loss for words, but it is coaxed by Honoka and she receives "a lesson" of Honoka as well as a younger brother if it notice. The future of the love erotic life of the protagonist who has been related not only to Honoka but also to an older sister in this way?