久しぶりに訪れた親戚の家。そこで俺が見たのは、縁側や洗面所で無心にオナニーに耽る従姉・日奈子の姿だった。「見とったと？ みんなにバラされたら恥ずかしくて死ぬけん…！」 弱みを握られ涙目で懇願する彼女に、俺は‘秘密のオナサポ’を要求する。「こぎゃんしてよかと？///」顔を真っ赤にしながら熊本弁で一生懸命にチ●ポをご奉仕してくれる彼女。田舎の夏の、誰にも言えない主観密着ドキュメント！

It had been a while since I'd visited my relatives' house. What I saw there was my cousin Hinako, lost in masturbation on the veranda and in the bathroom. "You saw me? I'll die of embarrassment if you tell everyone…!" With her eyes in tears and begging me for my secret, I demanded 'secret masturbation support' from her. "Is it okay if I do this?///" With her face bright red, she diligently serviced my penis in Kumamoto dialect. A first-person, intimate documentary of a summer in the countryside that you can't tell anyone about!