Horizon no Ue ~Yogen no Sho~

A long, long time ago, a world shrouded in thick dark clouds was transformed when strangers arrived from distant lands. Revered as gods, they banished the darkness, flooding the earth with light. New life bloomed—trees, animals, fish, birds. Yet some embraced the shadow and were exiled to the world's core, a place called 'Est.' The rest united in a land named 'Kaerum.' Over the ages, the two diverged, and their boundary became known as... 'Horizon.'