Begining of a legendary story

This world is divided into three parts, and across the entire world, most regions are covered by forests. Each forest is ruled by a Warlord, who controls and protects it.

The three great forests are:

Shem Forest

Kol Forest

Med Forest

In this world, there exist rare and mysterious Melob Trees. Every Melob Tree grows special apples known as Typical Apples. Each Typical Apple grants a unique power.

However, these apples cannot be taken by force. You cannot touch, cut, burn, or eat the tree or its apples. Every Melob Tree has its own will and power. Only if a Melob Tree chooses you may you eat one single apple—never more than one.

When someone eats a Typical Apple, a leaf from the Melob Tree flies toward their heart and binds to it. This leaf forms a curse and a promise:

If the user kills a human or misuses the power, the leaf will explode their heart, killing them instantly.

And near anyone  kind hearted human gained this power mean the leaf is recycling 

Only people with pure and kind hearts are chosen by the Melob Trees.

If someone wishes to destroy the leaf, they must fully awaken their Typical Apple power. Once awakened, the leaf flies away. After that, the person can kill others—but the power system recognizes this as corruption.

There are five types of Typical Apple powers:

Elemental

Transformation

Shadow

Skill

Neporeto (a rare and unique type)

The Main Hero

The main hero possesses Neporeto, a unique ability. His dream is to become the Lord of the Shem Forest.