(Flashback):

Japan: 1195 AD (Kamakura period)

485 years have passed and Japan had changed. Samurai has become more powerful and and grown in size.

Roman, Dean, and Seth has grown up to be powerful samurai, hunting gem yōkai (Japanese demons) and became mercenary to the most powerful clans such as the Minamoto clan,the Fujiwara clan and the Hōjō clan.

Mystic Quartz became one of the few women in Japan who became an onna-bugeisha (a female samurai) and fight alongside with her "sons".

Then everything changed with a shocking betrayal.

It was a cold and windy autumn night. The Crystal Gems was hunting for gem yōkai.

Then all of the sudden, Seth heard a small rustle.

Seth: Did you hear something?

Roman: It just the wind.

On what they didn't know, a small black Amanojaku (a small oni) was hiding behind the bushes. The small demon stealthily sneaks behind Seth and possessed him. He felt a sharp pain.

Seth:(winces and groans)

Mystic: Seth, are you alright?

Seth:(winces) I'm fine.

Roman activated his third eye to sense the demons aura.

Roman: The demons are located northeast from here.

Mystic: Alright, lead the way.

They rode on horseback to hunt down the demons. While tracking for the demon, Seth starts having huge headaches. He quietly winces in pain.

Mystic:(concerned) Seth. Do you need help?

Seth:(smiles) Mystic, don't worry about me. I'm fine.

He forms a weak but warm smiled at Mystic.

They tracked the demon to a cave.

Dean: Where the demons?

Roman: Huh? That's weird. The demons has to be in here.

He deactivated his third eye and slowly analyzes the cave.

Then they hears some deep growls and snarls

Roman, Mystic and Dean slowly turned around. They saw their own comrade slowly transform into a demon.

His light peach hair, turned into jet black hair. His pearl turns black. His fair skin turns gray and clammy. His eyes turns blood red and grows sharp fangs.

Seth:(growls) I'm tired of not having the voice in the team! And as for you!

He starts eyeing at Dean and Roman.

Seth:(growls) I'm tired of you making fun of me,calling me the weak link!

He activated his black spear from his corrupted pearl and targets at Dean and Roman!

Seth:(smirks) Now it time for you to pay your sin…..with your LIFE!

They were paralyzed and shocked that there comrade and "brother" turn against them.

Seth: TIME TO DIE!

Seth darted at them to end their life. Roman and Dean hugged together and closed their eyes, waiting Seth to take their life.

Roman and Dean: NO!

Mystic quickly used herself as a shield and Seth impaled her instead in Dean and Roman.

Even though that she was in pain, She saw Seth and just smiled at him.

Mystic: Seth… I will always love…..

Before she finish her sentence, she turns into dust, leaving her gem behind.

Dean and Roman was shocked that Mystic was gone.

Roman and Dean: Mystic!

Seth shows no remorse for what he done for his mentor and "mother".

Then his tone changed into a deep and brooding voice.

Seth:(deep voice) She was pathetic, trying to risk her life for you! Weak minded fool!

Dean was furious that he berates and disrespect Mystic.

Dean:(furious) SHUT UP! Don't you ever disrespect her!

Dean tried to attack him, but Seth overpowers him and knocks him out unconscious.

Roman: DEAN!

Roman activates his gauntlets and tried to attack him, but Seth uses strong force and knocks him out.

Seth: As of right now, We are no longer brothers!

He vanished into the night.

Roman:(groans) Seth...

He saw Dean unconscious and saw Mystic's gem. He picked it up and hugged the gem close to him and broke down crying.

Roman:(crying) Mystic…..Mystic!

The family is now broken.

To Be Continued…