My brother-in-law had to go abroad suddenly due to work leaving his wife alone at home. They decided that since they couldn't find anyone else to watch their niece Hikaru, she would stay with us during their absence. However, there was something strange about her; she seemed unusually close or even teasing with her vulnerable appearance. One day while relaxing in the living room, we caught Hikaru masturbating and accidentally saw her. But it turned out to be a devilish seduction by my adorably naughty niece!

兄夫婦が急な仕事で海外に行ってしまった。留守の間、姪っ子のひかるを預かることになったのだが妙に距離が近かったりみせつけるかのように無防備な姿をさらす。ある日リビングでひかるがオナニーをしているところに遭遇し、覗いているのがバレてしまう。だが、それは小悪魔姪っ子の見せつけ誘惑だった！