Sometimes, this world is as suffocating as the bottom of the water. Even when the lights are on, I feel like I'm in the dark. I want to be illuminated. I want to connect. In reality, I meet many people of the opposite sex, but no one will find me. But with a matching app, you might be connected to someone by the thread of fate. Even if it's not normal. Even if it's a twisted desire. Even if there are people who get pleasure by hurting themselves and others. Happiness is born for every matching app. Hell is born. And then, you and I sink into the fish tank. This story is about various people who met on a "matching app". "So, shall I kill you instead?"