You are protecting your clan and village from invasion of Abyss Devil. You and your ninja clan tried to fight back, but the results were not as expected, some of them died and only you were left. That's when a group of other ninjas started to help. After everything was finished, one of them carried your body right after you fainted, you heard a few words from them that say

"You were safe now..."

When you wake up, you find yourself in a strange place and it seems like this is a secret ninja clan, there are many cherry blossom trees, high mountains, and some wind which brings a different air