Reincarnation: From Commonplace to the King of Heroes

Issei VS Riser

After Gil's little "session" with them, he decided to pay Issei a little visit

He appeared in Issei's room through a gate of Babylon
Issei-"What the- who are you?!"
Gil-"You are Issei Hyoudou, correct?"
Issei-"Y-yeah, why?"
Gil-"Giorno has told me about your situation. Come, we have much to discuss"

Two days later, at Riser's wedding

Riser emerge from a pillar of flames in front of his guests
"Greetings, renowned devils of the underworld! On behalf of the Phenex household, I would like to thank each and every one of you for coming today. This is a historic moment for the world of devils and I would like my guests to be the first to know. Two great dynasties are about to become one"
He said the last part with a bit of disgust in his voice

"And now, I present to you, my bride: Rias Gremory"
Right as Rias appears in front of the guests, Issei busts into the wedding hall with the boosted gear
Rias-"Issei!"
Issei-"Rias!"

Riser-"Who do you think you are, boy?!"
"Finally! My ticket out of this mess is here!"

Issei-"I'm Issei Hyoudou and I'm here to bring Rias where she belongs! No ones gonna take anything from her that she doesn't want to give!"
Riser-"How dare you! Cease him!"
Koneko and the rest of the peerage were just about to help out but Issei blasted them away with [Dragon Shot]
Akeno-"eh? Issei wasn't this strong yesterday"

Riser-"What is the meaning of this?!"
At this moment, Sirzechs revealed himself
Sirzechs-"It's just a little entertainment I prepared"
Riser-"What exactly do you mean by entertainment?"
Sirzechs-"I watched the game, Riser. And quite honestly, I was underwhelmed by you"

Riser-"The hell do you mean? I took on her entire peerage by myself and you were 'underwhelmed'?"
"It's the result that counts, my lord"
Sirzechs-"In the past. The games don't mean what they used to. And besides, you were nearby brought to your knees by a first time competitor, I think you should be given another chance"
He looks at Issei
"You there, they say you possess the power of the Red Dragon. I, for one, want to see what you are made off"
Riser-"I see, you want a fight"

At this moment, Gil, who is sitting on his throne, used The World Over Heaven to transmit a brief telepathic message to him
"Change of plans, Riser. You are fighting him"
Riser-"What?! But he won't last a minute!"
Gil-"Just trust me on this matter, my foolish disciple"

Rias-Issei, don't do it!"
Riser-"Relax, Rias. I'm sure your pawn can handle himself"

Sirzechs-"So tell me, dragon. If you were the victor, what would you like as your reward?"
Devil-"You can't be serious!"
Devil 2-"A reward?! For a lower class like him?!"
Sirzechs-"Your king has spoken. A lower class or not, he will get his prize"

He turns back to Issei
"So what would you like to receive? A title? A woman of great beauty? Ask, and if you win; you shall receive"
Issei-"Fine, there's only one thing I want....Rias Gremory!"
Sirzechs-"Alright, it is time to get started"

Issei-"I'm ready when you are, Riser"
Riser-"Quite the confident one, aren't you? Come on boy, fight me!"
Riser covers himself in phoenix flames and dash towards Issei

Issei-"BALANCE BREAKER!"