After having that heartfelt moment, they continue waiting for Stain. Eri becomes concerned when hours pass after Stain left to scout out the Shie Hassaikai compound. 

Eri: Stain should've been back by now. 

Aizen: Maybe he ran into a Fake Hero. You know how he is with that. 

After Aizen finishes his sentence, an explosion blows up the door to the Hideout as a gang of Yakuza thugs led by Toya Setsuno swarm the hideout. 

Setsuno: Search this place! Find Eri! Overhaul wants her alive!

Eri and Aizen quickly arm themselves and begin to attack the Yakuza thugs. 

Aizen: We're right here you sons of bitches! 

Aizen shoots at the Yakuza thugs, but Swtsuno uses his Larceny Quirk to steal his guns and throws them off to the side. 

Aizen: Goddamn it!

Setsuno: We were supposed to find Eri here. Where is she?!

Aizen: Kiss my ass!

Setsuno: Such disrespect! Show this brat how to show respect to your elders!

Five Yakuza thugs begin to surround Aizen. They are armed with swords. Aizen simply laughs.

Aizen: Five guys? That's it?

Setsuno whistles more Yakuza thugs to surround Aizen. 

Aizen: I'm feeling generous today. Walk away and you live. Otherwise I'm gonna kill you. 

The Yakuza thugs laugh at Aizen's threat.

Yakuza Thug: Ha! Very funny kid!

One Yakuza thug charges at Aizen with his sword, but Aizen counters by stealing his sword and thrusting it into his chest. 

Aizen: Who's next?

As Aizen says that, Eri ambushes Setsuno and cuts his tendons, immobilizing him. 

Eri: You wanted me?! Well here I am! 

Seeing their boss downed by Eri, they begin charging at her, but Aizen begins cutting through the Yakuza thugs as Eri does the same. Aizen sees one of the thugs going for one of his Desert Eagles. He takes the Katana and throws it at the thug killing him. Aizen goes for his Desert Eagle and shoots one of the Yakuza thugs trying to ambush Eri. Eri sees a thug trying to attack Aizen.

Eri: Aizen! Duck!

Aizen ducks as Eri throws a throwing knife at the Yakuza thug and lands at his throat, killing him. Once they cleared the hideout of Yakuza thugs, they walk over to the wounded Setsuno.

Setsuno: Disappointing that we meet like this Eri...

Eri: How did you find our hideout?!

Setsuno: We've had our suspicions on the Hero Killer. It was only recently did we confirm it. Overhaul has him!

Setsuno pulls out a flashdrive from his pocket.

Setsuno: Overhaul has a message for you, little Eri.

Eri takes the flashdrive as she looks to Aizen. Aizen nods as she begins to walk away.

Setsuno: Overhaul is waiting for you!

Aizen immediately shoots Setsuno in the head with his Desert Eagle. After doing that, Aizen meets up with Eri at the computer. Eri puts the flashdrive in where a video starts playing.  The video shows a bruised and beaten Stain. This sight horrified Eri. The video then pans to Overhaul.

Overhaul(Video): Hello Eri. If you've managed to kill my men, then I extend an invitation to you. As you can see, I have your precious Hero Killer under my hospitality. I imagine he's here because of you. I can't imagine any other reason. Come home. Come back to us. We have great work to achieve. If you don't, then I'm going to do society a favor by killing the Hero Killer.

Stain(Video): Don't do it Eri! Continue the fight! Continue the war!

Overhaul then proceeds to use his Quirk to disassemble and reassemble Stain. Seeing that terrified Eri for she had experienced that first hand hundreds of times. 

Aizen: Goddamn......

When Stain is reassembled, Stain is screaming in pain. 

Overhaul(Video): The Hero Killer is a strong one, but how long can he endure this pain? Come home Eri. We're waiting for you.

The video cuts to black as Eri sits down in a chair, drained from seeing Overhaul again.

Aizen: Chirst.......

Eri: We have to save him!

Aizen: You know that's what Overhaul wants, right? 

Eri: What other choice do I have? I have to save him! I can't just leave him to die! You saw what he did to Stain!

Aizen: I saw. So why not we spring his trap?

Eri: What.....what do you mean?

Aizen: We go to the Shie Hassaikai compound. We're gonna save Stain and kill Overhaul! Does that sound like a plan?

Eri found her determination and agreed to Aizen's words. Eri and Aizen suit up and prepared their gear and left the hideout to the Shie Hassaikai hideout. Once they reach the front of the compound, the Hero Killers readied themselves.

Grim Reaper: You know we might end up dead, right?

Eri: I know. But as long as Overhaul dies, it doesn't matter. This nightmare has gone on long enough. It ends tonight!

Grim Reaper: You and me both. Whatever happens here, I got your back.

The Reaper's words warmed Eri, Whatever worries she had about the coming assault seemed to go away. 

Eri: Thank you Aizen.

Grim Reaper: You ready?

Eri: Yes. 

Eri and Reaper walk into the office building and quickly get into the compound. This was the first step to a larger assault. The two Hero Killers were ready to whatever Shie Hassaikai was going to throw at them. But for them, this assault was going to end in only one way: with Overhaul dead. The rest didn't matter.