I whipped up a fully translated training mode.
Just dump that ish in the Information folder if you want crude text elsewhere, Training.ini for just training mode.

This magus (Sagara Hyouma) is trying to summon Jack as a Servant, but failing so he's like "lol maybe I need to murder a woman for it to work then", so he decides to use this woman who he used suggestion on so he could live in her apartment and mooch off her for the war (Rikudou Reika). So he's killing Reika and she's like "noo I don't want to die I want to live" and that's what pulls Jack in. Even though Hyouma has the command spells, Jack is calling Reika Master/Mother, and he starts to realize something is wrong. But before he can tell her to kill herself, she cuts off his lower jaw and his hand with the command spells, then tells Reika she'll help her, Reika blacks out.

When she comes to, Jack has stitched up her wounds (and also Hyouma's, he's still alive, ohh guroi guroi). They go back to Reika's apartment where Jack explains about the grail war and such. Hyouma's hand still has his command seals since he's still alive, so they transfer them to Reika. They also need a vessel for the Grail (?) so Reika brings out this "ruby" Hyouma owned that Jack realizes is actually a mineralized human heart. Last order of business is that Jack needs to eat souls to stay around since Reika's not a magus, she assures Reika that she'll just eat bad people because their souls taste better (lol). So Reika suggests Hyouma, says to him "hey I guess I loved you but oh well you'll live in my memories lol", Jack nomnoms him. By now you may have noticed Reika just does not give a single fuck. They decide they're going to participate in the grail war, Reika has no wish, Jack wants to go back inside of her mother (oh that's where the "unbirth" title comes from…)

That night Reika has a dream of Jack's memories, being ronery on the streets, cutting open some woman (not sure if it was her real mother or some woman she was calling mother) wanting to go back inside her where it was warm, etcetc. Jack is messed up.

They wake up and it's time to go nom on souls, Reika chose this loan shark company because they're "bad people". So Jack goes and uses the Mist on them and kills everyone. After that Reika says they're going to go home and Jack's all surprised because she never had a home. Reika says she's going to make hamburger, Jack's all "but Servants don't need to eat…" and Reika's like lolwhocares eat it anyway. So Jack is all and they go home.