A young man who had moved to Tokyo for college found himself captivated by his beautiful neighbor. After some time, he discovered that she was married and her name was Amane-san. One day, while walking down the hallway, he noticed her phone lying on the floor and decided to return it to her. To his surprise, her husband seemed busy and lonely. The next day, when another phone fell again, he went back to deliver it once more...

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…。