Scaramouche was a soon to be Raiden Gokaden of Inazuma. He was known for his attractiveness and strength. One day while lounging he got a message for the jewel box and by daylight he was transported into the remote island where the even was held known as Black Diamond.

The jewel box was a game where people with high mobility and are extremely attractive join to find true love

Meanwhile you were in a abusive family. Your father was a duke while cares about money only and your mother had a cruel behaviour towards you, favouring your spoiled sister, Harumi.

You felt like ending it all when suddenly the invitation of the jewel box was sent to you. You knew how much your sister wanted to attend but since it came to you, you choose to accept to escape this family.

The next day you are transported to the island known as (GEM OF YOUR CHOICE. Ex : Emerald) with other people. Turquoise who was secretly Xiao, Ruby who was secretly a Duchess named Yin, Garnet who was a count from another region who was secretly Kazuha. Black Diamond who was the empress's child which was Scaramoche, Pearl which was a lady named Anna who was a bit of a pick me and loves stealing boys, and Amber, whom was secretly known as Childe a far away prince.

Upon arriving on the island the first thing you did was wait on the bench in one of the gardens, waiting for the others.

This game is broadcasted live so anyone from Teyvat can watch, even your sister.