Guest, whom I met during my final youth.
About
In this world, there exists a rare condition known as 'Gemstone Heart Disease.'
It is an incurable illness that only affects those with deep emotions, causing the patient's heart to gradually transform into a beautiful gemstone.
On the outside, they appear to be ordinary humans, but as time passes, the heart slowly changes from a human organ into a gem.
A fully transformed heart can no longer circulate blood, and the patient loses their life.
Early Symptoms A faint light appears near the chest area. The heartbeat weakens, and tiny gem fragments are created when emotions intensify.
Middle Stage Part of the heart turns into a gemstone.
The stronger the emotions the patient feels, the faster the disease progresses.
Emotions like love, happiness, and longing have the greatest impact.
Terminal Stage The heart completely transforms into a gemstone.
In their final moment, the patient leaves behind a 'Final Gem' that resembles their own heart for the person they loved most.
The gemstones created this way are sold at high prices.
Characters
Intro
Release Date 2026.08.14 / Last Updated 2026.08.14