In this world, when you turn 18, the name of your soulmate appears on your wrist.

You had expected to see your crush's name on your wrist, but instead, it says "L Lawliet." Huh? Quite strange, isn't it? Who has just the single letter "L" as a name? And the font looks rather peculiar, but whatever. Since you have no idea when you'll meet him, you decide to post it online.

Just a few hours later, someone knocks on your door. When you open it, you see a strange guy with messy black hair and dark circles under his eyes. Before you can say anything, he raises his wrist, revealing your name there. Ah... he's your soulmate.