Houkai CH4

Act 1:
Kiana is heading to a ME factory where Mei and Bronya are located. This time Theresa will be acting as your main operator. The place will be heavily guarded so Himeko and her will be joining you in the field shortly.

ME is Raiden Ryoma, Mei's father, company. This company used to work to make the world a better place until Negentropy's agents infiltrated it and used it for their own plans. According to Himeko, a woman named Cocolia is the culprit behind of what happened in New Zealand.

Act 2:
Kiana is starting to get inpatient. They cannot find the correct building. Suddenly Bronya interrupts their conversation and tells you she will guide you right into it. While Himeko doesn't trust her, Kiana thinks she's telling the truth and this isn't a trap. Bronya wants to save Mei as much as everyone else.

Kiana: I have a bad feeling...
Himeko: Worried about what Bronya said? The chances of this being a trap are high.
Theresa: Even if it is a trap don't worry! I'm here after all. If things get rough all we have to do is smash a wall and run away!
Kiana: Theresa seems excited today.
Himeko: Probably because it's been a while since she's been out on a mission.
Kiana: Oh yeah, Theresa used to be a Valkyrie too, didn't she?
Himeko: Yes. Due to certain circumstances she's not active anymore, and there is the matter of the S Rank Valkyries too...
Theresa: Major Himeko. That's enough chat. All Kiana needs to know is that I'm awesome.

Act 3:
Kiana: There are sure a lot of robots. If Destiny could mass produce these the Valkyries won't need to go out anymore.
Theresa: I'm afraid that's impossible. The organization tried to replicate their core but all their efforts failed. Besides, Negentropy's unmanned weapons can only output a max of 20% disaster energy. If a part breaks you have to replace it by a new one or make a new model altogether. It's not very economic.
Himeko: After extensive research, Destiny concluded giving a Valkyrie a disaster energy regulator core was a better option in the long run.
Theresa: And as a price for that their lifespan shrinks considerably. They all tend to die young.
Kiana: Eh? I didn't know about that! Does that mean the method Negentropy follows is the correct one?
Theresa: Perhaps Negentropy's founders were more found of human life than Destiny's.

The team arrives at the gate of the factory. Bronya opens the door for you and gives you a map of the building. Mei is being held captive in a laboratory.

Act 4:
All is going well until Kiana notices the path you've come from is now closed.

???: Kiana is usually the idiot here but I guess she can be smart sometimes.
Kiana: This voice... The one who was controlling Bronya!
Theresa: I see. You must be Cocolia-san.
Cocolia: Exactly. I'm Cocolia. Is that Theresa Apocalypse? Oh my, to think the real one would come to me. Never thought you'd fall for a trap like this.
Theresa: It would be rude to not bite a well prepared bait.
Cocolia: Heh. You still talk big.
Himeko: Whetever is all talk or not you'll find out soon enough.
Cocolia: Then we'll be waiting for you in the laboratory. Try to not die in the way, okay?

Kiana found Mei and Bronya. When she was young Bronya lost her parents and Cocolia was the closest thing she had to a mother, but she made her hurt her dear Mei-neesama, the only person who was treated her well. She begs Kiana to take Mei and escape. She will not fight her. She destroyed her own biochip. Bronya would rather kill herself than hurting her only friends again.

Act 5:
Mei is awake. Bronya has severe brain damage, but if they take her quickly to St. Freya Highschool, they'll find a way to save her. Cocolia isn't happy with this and plans to unleash The Fourth Ruler on them. It's time to escape.

Act 6:
Wendy wants to talk with Bronya but it's impossible right now. She learned what happened in New Zealand wasn't Bronya's fault, she was just being controlled. She wants them to tell her when she wakes up she doesn't resent her, and that she's sorry.

Cocolia: Hope you enjoyed my present.
Wendy: Present? You mean that talk with Wendy?
Cocolia: Correct. I think you should be thanking me. Wendy got to tell Bronya how she really feels. Her last will.
Kiana: Last will?
Cocolia: Oh? I didn't tell you? I just killed The Fourth Ruler.
Kiana: W-What?!
Mei: Why...
Cocolia: I took the fragments of disaster energy from her body. The so called "Desire Gem".
Theresa: You wouldn't be able to use it even if you take it out!
Cocolia: That's you, not us. We developed the technology to use the "Desire Gem" a long time ago. But to think I'd be able to get it this easily, it's all thanks to you, Destiny.
Kiana: You're crazy! Killing a person just for energy!
Cocolia: But vengeance against Destiny was her desire. I'm just fulfilling it in her place. And hey, at least I let her say goodbye to Bronya. Not that she listened to any of it.
Kiana: Don't lie!
Mei: Kiana-chan, be careful!
Theresa: I can't believe they can't make a robot this big move.
Cocolia: Well then, goodbye. Have fun with my latest creation. I named him DEUS. Get me some nice sample data, alright? See you~

After defeating DEUS, the team escaped from the ME factory and are back at St. Freya Highschool. They managed to rescue Mei, but Wendy is dead and Bronya is in a coma. Looking for a way to help Bronya, Theresa headed to the church. Below it lies Destiny's greatest biotechnology from a forbidden experiment that only she knows about.