隠世ノ鮮紅花

A long way away from towns, there is a ninja tribe's village deep in a forest.
They say that ninjas in the village own monstrous power so they have
been feared by ordinary people for a long time.

In fear of their potential threat, the nation finally decides to wipe them out. This leads to a tragic event when the heads of significant families in the tribe hold a conference over the nation's decision, as almost all of ninjas with ogre power are slain.