有天男主角浅野あたる在自家公寓走廊撿到一隻鄰居人妻蒼山愛奈不小心掉的手機，想說等一下要怎麼還手機時突然接到失主打這支手機，請男主角去對方家還手機後陷入美貌人妻陷阱繼而無數次縱慾雙方的劇情。

大学進学のため上京してきた男は美しいお隣さんに心惹かれていた。暫くして彼女は人妻で名前は愛奈さん。ある日、いつもの廊下にスマホが落ちていて愛奈さんに届けると、夫が忙しく寂しそうにしている事を知る。翌日もスマホが落ちているので再び彼女の部屋へとスマホを届けに行くが…。

A man who came to Tokyo to attend university was attracted to his beautiful neighbor. After a while, she became a married woman and her name was Aina. One day, I find a smartphone in the hallway where my girlfriend always goes, and when I bring it to my girlfriend, Aina, I find out that her husband is busy and seems lonely. The next day, her smartphone is still gone, so she goes to her room again to deliver it, but…