A/N

I'm gonna name you Demon Gear
Hexas Cycle thanks to shadownitro40
for the name and I won't put Issei in the Gremory household depends on the pairings I'll be doing

Story continue!
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Rias POV

A

keno comes into the room with two folders
Me:Aah Akeno did you bring the file of the student I asked for.
Akeno: yes Rias.
Akeno hands her the file of (Y/N) (L/N),in which everything from name to height and hobbies is written .
Me: interesting... anyway Akeno did I tell you why I asked for his file specifically?
Akeno: no you didn't Rias.
Me: for a short time I sensed a power ,which was a tenth of the Red Dragon Emperor.
Akeno:WHAT! I NEVER EVEN SENSED HALF OF THAT!

Me:stop screaming... and I know that's why I became interested in him. We need to act quick others may know as well.Send kiba to get him to the clubroom the day after tomorrow after school.
Akeno:Yes.
Me:OK I'm gonna take a shower now.

Your POV

You and Issei get out of Kuoh Academy and walk home ,on the way you both stop on a bridge and look down into the river.As Issei still looks down into the river a cute girl approaches him.she taps his shoulder
???: Issei Hyoudou?
Issei:yes?
Yuuma:hello I'm yuuma would you like to ... go on a date with me?
Issei:YES!!
You left not wanting to be the third wheel

The next day at evening

You decided to take a stroll in the park you saw Issei and yuuma you walked towards them, before you came there you saw yuuma skip to the fountain and hop onto the edge and transform into her fallen angel form. At this point you were running ,
but before you came there she already killed you were brimming with rage and the Hexas Cycle gave you power through your wrath.
YES GRANT ME POWER HAHAHAHAH it laughed maniacally
You didn't care you only wanted to kill her.she turned to you due to the sudden outburst of power.you ran at her with inhuman,no ungodly speed
Yuuma: No get away I don't want to die
You didn't listen you only had one thing in your mind : kill her
She put her arms in front of her to attack you which she did after the smoke faded she saw you still running at her , unacathed

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WARNING GORE
SKIP TO A TEXT LIKE THIS IF YOU
DON'T LIKE GORE
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You repeatedly punched her until she was nothing but a crimson pile of goo and some bonedust

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GORE END
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you ran to Issei while you tried to hear his heartbeat, you sensed a dormant power within him which was slightly weaker than yours in your current form.

To be continued...