It’s been two months since Gen’s close friend Kotone passed away from sickness. All she left was a letter asking him to go treasure hunting together. Along with it was an old map. Since it is his final promise to her, he sets out on this journey to find something precious.

It’s been two months since Gen’s close friend Kotone passed away from sickness. All she left was a letter asking him to go treasure hunting together. Along with it was an old map. Since it is his final promise to her, he sets out on this journey to find something precious.