Takers to save humanity. 

Zons to destroy humanity. 

There can never be reconciliation between these two worlds. 

You either on one side, or the other, but never both. 

But, now, a weird trend of evil has arisen. 

After what has happened with Hikami Souri, does it really do them good? Or will it incur wrath upon them... In fact, incur wrath directly at them it did! Because there is an evil man attacking them in disguised trying to bring them down now for reasons unknown. 

In the midst of all these are three siblings; 

Mizuki, the eldest sister, struggles hopelessly to release her grasp over Akemi, the treasure and dearest of the family.

Hiroshi, the middle boy, the one destined for great events, take it upon himself to investigate the series of unfortunate happenings in the town and the nearby territory, to end up uncovering a dangerous evil.

Akemi, the youngest sister, sometimes sullen, but loves fiercely, is trying to break free and achieve something, but trapped either in studies or within the mansion.

They are the descendants of Samurai, the Hirohoshi's Bloodline. They are the Cagers, the ones able to contain and defeat evil, namely Zons, through five centuries, or its human messengers, since fifteen centuries past.