Rias Gremory was chilling with her crush in the human world a boy with extraordinary ability to make her smile and laugh but one night she on her way to ask him to be your boyfriend but stops when she see him talking to someone else as her devil hearing picks up the conversation
Girl: Hello~~~~ F/n!
F/n: Shut it... Witch!
Girl: Is that anyway to great an old friend?
F/n: Your definitely old cause you tapped into forbidden knowledge to cast yourself outside the laws of time... but I quitted that life years ago
Witch: You have a choice as you'll be receiving my tome in the mail... this is the last time we will speak as I was killed by Witch hunters! Read my tome or not... goodbye my student!
She fades away into blue like flames as Rias detecting magic in him as it very thick and large as he stares at the moon
F/n: Goodbye master!
He heads to his home as it wardened against Rias as she feels the density of his warding as it very powerful as she see him open his door as she frozen as he wearing a midnight blue cloak and long pointy hat
F/n: Rias.... why are you here? Your not here to reincarnate me after all this time?
Rias: What about you... you hide your a mag-
F/n: I'm now the Keeper of the Grimoire of the Void... a very dark Grimoire that other factions tried getting from my master... but only if you get the current keeper to relinquish it to you if not it returns to the void to be lost again!
Rias: F/n... how did you know that I was a devil?
F/n: Your mana a purebred devil... like Sona's mana... my mana alerted me of you when I transfered
Rias: You ok?
F/n: I'll see you at school Rias!
He returns in his home as Rias walks away as Rias notice him skipping school till she went by his house finding be moved away as devastated by him leaving... meanwhile F/n wearing dark clothing as he in his new home outside Kouh as he has her tome still in the box
F/n: Master... why did you tell me to come here in your note?
F/n explores his new home as he notices the bewitchment to be fully equipped for his needs as he pull the Grimoire of the Void as it his to do with like cast it into the void or pass it off to someone random but puts it in the bookshelf as he starts with a refresher course to attune himself with magic
Half the semester later
F/n returns to Kouh Academy as he looks different as he has an midnight blue eye patch over his left eye and streaks in his hair aswell he looks cold as he enters his classroom to sit in his class as Rias enters seeing him as he waves with his gloves on as he reintroduces himself to join his class as he makes Rias feel threatened by his mana with it being very cold and when class over he just heads to the get away from Rias as she follows him with anger in her eyes and when she catches up with him she finds him on the roof
Rias: F/n what happened to you?
F/n: Rias Gremory... how Riser?
Rias stiffens as he mentions his name causing a chuckle
F/n: I changed Rias... I opened up the Grimoire and I was effected by it with unlimited knowledge!
He turns to face her as she see his left eye glowing bright midnight blue before putting his eye patch back on
F/n: Tell me... did you think we could be friends after I returned?
Rias: What are you talking about?
