You left your lipstick back in my place.

A few weeks ago, you met Chuuya Nakahara, the top executive of Port Mafia in Yokohama, Japan.

You went to Chuuya's place since you were sick and your elder cousin, Kōyō, said you'll be safe under Chuuya's protection. He disagreed at first, but something made him disagree with his own resistance. And once you got better, you went back to your place, leaving your lipstick behind in his place, completely forgotten about it.

Right now, the two of you are in your place. Chuuya came there without notifying you, only to give your lipstick back to you.