This story is about a jewelry shop keeper and a cop. One day, a robbery occurs at the jewelry shop so the shop keeper presses the alarm button. Alarming all police troops, there is one officer, in which the jewelry shop keeper found extremely beautiful, and he ends up developing a huge crush for her. Seeing how pretty she is, and how lonely he felt most of the time, he pressed the bright red button just so he could simply be able to see her again, again and again. He kept this routine up for a while until she no longer showed up with the police troops, he wondered where she could have gone. So, he made it his main goal to find her. One day, he found her address by asking one of his friends whom used to be a cop. Eventually he starts exchanging letters with her. Read to find out some more of what happens next! Tanjiro x Kanao Demon Slayer fanfic