Rengoku and Izuku were brothers as Izuku always looked up to his Older brother who was a Hero/Demon Slayer and he inspired Izuku as he wanted to be a hero like him however one day Rengoku is killed by a Villain saddening Izuku and from that day on h...
We see a Young Man waiting patently at home this Man is Kyojuro Rengoku and he's about to become an Older brother which he cannot wait for him to Meet his brother
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Rengoku: This is gonna be the best day of my Life Best Buddy
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Tengen: Wouldn't that be your wedding day
Rengoku: No Because I Become an older brother HAHAHA
Just then the door opened and Rengoku Saw his Parents as his mom was carrying a Baby and Rengoku was Excited
Rengoku: Is That Him
Inko: Yes
Shinjuro: Meet Izuku Shimura
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Izuku: *Cute baby Noises*
Rengoku: He's Perfect *Grabs and Holds him*
Kyojuro held izuku and he smiled and hugged his brother's shirt
Inko: Awwwe My baby Boy's together
Rengoku: He's gonna be the best Little brother
Kyojuro: just don't get to distracted from your achivements son
Rengoku: He's my Brother I wouldn't mind if he did
Inko: *Giggles* Your too Nice son
Rengoku was finally happy to have a Brother as His Mom Let Kyojuro feed him and that's when Tengen asks a Question
Tengen: You Think He'll be like us a Hero & a Demon Slayer
Rengoku: Just a Hero
Tengen: why say that
Rengoku: I have a Reason to work harder to Kill all demons to Protect my brother
Inko: Well don't go overboard
Rengoku: No Promises Mother
Inko SIghed but smiled as She took Izuku and put him to bed and Tengen left as Kyojuro got a message from his crow about a Demon
Rengoku: I Shall vanquish this Evil
Inko: Becareful
Rengoku Smiled and Nodded as he went out and Headed to the Area where he saw the Uppermoon Demon named Akaza
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Akaza: The Flame Hashira
Rengoku: Hello Demon I'm afraid this is gonna be your last night
Akaza tried punching him but rengoku acted fast and Cut his Arms off and went for the head but Akaza blocked it with his Left Leg and Jumped kicking Rengoku with his left but Rengoku used flame Breating
Rengoku: Flame Breathing Unknowing FIre
Akaza went to punch but was slashed by Rengoku who almost decapitated Akaza but Akaza Stopped it last Minute and then his neck Spurted blood and while distracted Rengoku went for the kill but was stopped when he saw this man
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Muzan: I'd stop unless You want me to slaughter Your family
Akaza: M-Muzan
Rengoku: King of Demons
Muzan: I won't allow Akaza die so unless you want your family to be mindless demons I suggest you stop
Rengoku:......
Muzan: You'll have a Rematch one Day
Muzan Grabbed Akaza and Disappeared as Rengoku rushed back home and saw his family safe
Rengoku: I Must protect them No Matter what
Rengoku went in as he acted like everything was normal
