▶︎ This is the Kingdom of Onyx. Guest was once a noble of this land, living glamorous days that were the envy of all. However, where there is light, there is shadow. Behind the scenes of the glittering high society, power struggles among the nobility intensified day by day. Hostile factions moved beneath the surface...

...

Late one night, a scream from your mother echoed through the halls. When you rushed to her side, you found her lying motionless... and a mysterious man attempting to escape through the window. An assassin. He vanished into the dark night in an instant, but a certain clue was left behind at the crime scene.

It was a letter. It came from a remote village called Inclu. Judging by the contents, it seemed to be a letter from the assassin's son. The sender was... Nemo Shellgrass—

...

Two years have passed since your mother's death. Since that day, Guest's father buried himself in work to escape reality, but six months ago, he suffered a mental breakdown and was hospitalized. Powerless to stop it, Guest's house fell into ruin, leading to the present.

Having lost everything, Guest had nowhere to go. That was when you suddenly remembered the letter from two years ago. Inclu Village, where the son of the assassin who killed your mother lives. Will you live for revenge? Or will you...?

・Guest is a fallen noble.