5 months have passed since the trip to the underworld. You, B/N, and Bardock still go over to Beerus's world to train with Whis. Bardock managed to grow in power with ease. He managed to get onto yours and B/N's power level. After unlocking the Super Saiyan god form, you just wanted to get stronger.

Whis: You three have definitely improved, but you still show more room for improvement.

Y/N: We can't all stay at our same power level!

You, B/N, and Bardock stop training with Whis and start to fight each other. The three of you start out with simple punches, but start to get more faster and more accurate with punches and kicks.

The fight escalated and small craters were starting to be made in the ground. The three of you then get in a triangle shape and punch in the center with your right arms. As your arms collided, B/N and Bardock had blue energy come from their fist, and you had orange energy. This got the attention of Whis.

Whis: I think that's enough for now.

Whis appears in the middle of the triangle and stops the sparring. You take a rest and drink some water before laying in the grass.

Beerus: So, are you ready for another fight?

Y/N: As much I would want to, I'm going to have to say no. You're way too strong. I'm not at a level yet where I can go against you.

Beerus: If there's one thing I can't stand, it's waiting. Hurry up and get to the point where you can get on my level.

B/N: Don't worry, lord Beerus. You shouldn't wait for too long before one of us challenges you again.

Beerus: I'll count your word on it.

/////////////////////////////////////////////////////

In the underworld, things haven't been doing well. Hundreds of years ago, a god of Norse mythology was sealed away. His name, was, Loki. But time is changing and the seal is starting to break. Sirzech quickly calls Rias and her peerage over to help.

Rias's peerage quickly get informed and use a magic circle to meet with Rias's older brother

Rias: What seems to be the problem, brother? 

Sirzech: We have a dangerous crisis on our hands. The seal that was created to seal off Loki is cracking. We can't make another one. Our only hope is to rebuild the seal and return him there.

Rias: But how?

???: I might have a solution to that.

An old man with a really long grey beard then enters the room. He also has a woman right next to him, which get's Issei's attention. Koneko then punches Issei, so he doesn't get any perverted thoughts. If you ask me, he deserves it.

Issei: So who's the old dude?

Sirzech: He is, Odin. The god of war and death. He rules an entire king called, Asgard. He is also the father of, Loki.

Issei: "god!" So does that mean that they're just as strong as, Beerus?

Odin: *laughs* Not to much on formalities, are ya? We may be gods, but we're not as strong as, lord Beerus is. Gods of destruction are on a completely different level of power.

Sirzech: Indeed. Rias, will you and another peerage be capable of dealing with Loki?

Rias: Do you even have to ask? We'll do what we can but we can only fight him for so long.

Kibba: If you ask me, I think this can be a good way to demonstrate how much our powers have improved.

Issei: Hell yeah! I think I can be a match for, Loki! He won't stand a chance!

Rias: Having confidence is good and all, but don't let your new level of power go to your head, Issei.

Issei: Sorry, Rias.

Rias and the others then start to head to a nearby lounge. When they get to the lounge they sit down on a nearby couch and drink some tea before they started to head out.

Issei: So how long has Loki been sealed away?

Rias: Hard to say. Some say that he was sealed away thousands of years ago and some say that he was sealed away hundreds of years ago. 

Issei: Didn't your brother say that he was sealed away hundreds of years ago?

Rias: Yeas, but even he doesn't know the exact time when he was sealed away.

Issei: Why was he sealed away in the first place?

Kibba: Legends have it that he wanted to destroy both heaven and hell, and to start another holy war. If that happened then none of us probably wouldn't be here today.

Issei: Sounds like a real pain.

Rossweisse: We're ready. The seal won't hold much longer.

Rias: Remember. Loki is a god and is far stronger than any other person you've faced. Don't let your guard down.

They teleport using another magic circle and make their way onto the battlefield where the seal was holding Loki. When they got there, Rias met one of her old friends.

Sona: So you're here too, huh?

Rias: Yeah. He may have been sealed away hundreds of years ago, but it feels like only yesterday.

Issei: Yo, Saji!

Saji: How ya doin Hyoudou?

Issei: Not much. You?

Saji: Ready to bust this Loki guy with the training I did for all those months!

Issei: You damn right!

Rias: Issei!

Sona: Saji!

Issei and Saji: Sorry.

Rossweisse: Pay attention. Here's here.

The seal then shatters and a man wearing white and has long silver hair is seen floating in the air. Someone else also caught them by surprise. A woman with blue long blue hair and blue eyes was also in the seal.

Loki: Well, that was annoying.

Esdeath: Not to mention rude, my love.

Rossweisse: Here me, Loki! Attacking the alfather is unforgivable!

Loki: And who's going to stop me? You? Though talented you may be, you can't match a god.

Rossweisse: You were always such a spoiled brat!

While all the others were focused on Loki, Rias and Sona were focused on Esdeath.

Rias: I thought you were killed before we sealed off, Loki. 

Esdeath: You really thought killing a general of the North is that easy? It's going to take more than a pair of devils to kill me.

Sona: We can clearly see that. We just need to know how!

Esdeath: there really isn't any point in explaining it to you devils! *unsheaths rapier* I'll enjoy killing you slowly.

The battle then began with Loki shooting energy blasts and Esdeath shooting huge icicles. Thanks to the training that they all put in, they dodged in perfect time and some just blocked them.

Issei: No offense, but you'll have to do better than that!

Issei then activates his balance breaker and puts on his red armour. He also got an upgrade where his armour came with dragon like wings.

Loki: So the Red Dragon emperor has found another host. Time flies by when you've been sealed away for hundreds of years.

Esdeath: Let's make this more fun.

Loki: Very well.

Lkoi opens multiple magic circles and multiple animals come out of them. Three giant wolves and one giant serpent king.

Rossweisse: This isn't good. They just summoned Fenrir, and the serpent king.

Issei: I don't care how many animals there are! I'm going to give this everything I've got, so we can win!

Esdeath: He's a sporty one, isn't he?

Loki: Indeed.

Issei then flies up to Loki and throws a punch. Loki dodges it and readies an energy blast in Issei's face. Loki is about to detonate it but was taken by surprise when issei just grabbed his hand and crushed it.

Issei: Sorry, but you're not doing that!

Loki: Arrogant!

Loki fires a barrage of energy blast at Issei which cause him to land back on the ground. Kiba and Xenovia then trap Fenrir in a cave surrounded by multiple blades. Rias and Sona focused on the Serpent king and the others focused on the two other wolves.

Issei: Alright, let's see. 10 of us vs two of you. Yep, that sounds fair!

Loki: You wield the power of one of the dragon emperors, but you act like a child when you use it.

Rossweisse: Here me, Loki. It's still not too late to apologize. You still may be forgiven.

Loki: But before you said it was unforgivable. Besides, I shouldn't apologize when he is clearly in the wrong!

The battle continued and minutes felt like hours. Course the battle did go past than 1 hour. The team nearly didn't manage anything. In fact, the battle was turning against their favour. The only progress they managed was taking down the serpent king and one of the wolves.

Loki: This is it, boy!

Esdeath: It was fun playing with you lot.

Esdeath makes a huge sphere of ice and Fenrir breaks free of his little sword prison. Loki then readied more energy blast. Rias and the others were trapped in a corner. They couldn't believe that they would do this bad while lasting against a god and a woman.

They sent the barrages of attacks and Issei closes his eyes and waits for the attack to hit. He kept his eyes closed for a while, but the attack didn't hit. He opens his eyes and sees a giant pillar of bright light appear right in front of the attack.

Y/N: What's going on here?

Issei looks in the light and sees 5 shadow figures. At first he didn't recognize the person speaking, but he finally recognized the voice.

Y/N: You're in a real fix aren't you? Issei