A unique worldview and steamy scenes are hallmarks of Water Moon Third's hit manga series, now brought to life! Our protagonist, Hiroki (a college dropout and unemployed), finds himself unexpectedly summoned by his uncle one day. Under his uncle's intense pressure, he reluctantly agrees to investigate his aunt's infidelity. As he follows her secretly, fate leads him to cross paths with a woman he's never seen as anything but family... What would you do if you found yourself face-to-face with this familiar yet forbidden figure in an intimate setting?

ねちっこく絡みつくような濡れ場と独特な世界観で異彩を放つ同人マンガ家・水無月三日のヒット作を遂に実写化！大学を中退した無職の俺（宏樹）はある日突然、叔父から呼び出しをくらい、半狂乱になっている叔父の気迫に押されて俺は分けもわからず叔母の不倫調査を請け負い、叔母の後を密かにつけたのだが…。身近すぎて異性として見たことがない女と「あらぬ場所」で遭遇してしまったらあなたならどうしますか？