Lost Lives Chronicle

In the Realm Of Sylvan, a Realm where every life can develop themselves by relying on the Tree Of Entis inside their Sea Of Consciousness. Which gives them a System Panel that can provide many knowledge and Skills depending on what they do.

A young boy named Kass has awakened a strange Innate Skill named [Nine Lives Cat]. This Skill gave him nine lives, and as long as he died, he could return to the day he received this Skill, along with being able to bring things from his previous life to his next life as well.

...

The seasons have changed; many years have passed.

Kass has gone through many ups and downs in his life. Whether it's a happy story or a sad story, until the day he 'betrayed' the association he had worked for all these years and was killed by a man who was like his younger brother.

And the Skill worked as it should. Send him back to the day he was about to begin his journey from the village.

But for some reason, when he checked the Innate Skill, Kass found that this 'second life' was actually his 'ninth life'. And in his Innate Skill Section, an additional mysterious Skill with an unknown name and unknown effects had appeared.

What is the origin of this Unknown Skill?

Is it something that interferes with [Nine Lives Cat] Skill?

Can he unravel the mystery of this Unknown Skill?

Perhaps this journey in this 'second life' would give him the answer to the question. 

Where are his lives?