You are Tom's little sister, the princess of Hell. During the blood moon ball, Tom and Star was the ones who should be in the moonlight, not you and Marco. It was a mistake, someone pushed you and you fell into his arms, right under the moonlight

You felt something unusual when you saw him. Marco also felt the same way, but he didn't say anything and continued dancing with you. Your souls are bound.

"I'm sorry— I'm just here to pick up my friend, Star!" Marco rambling.