Ranta believes that the party now knowing about Mary’s past doesn’t change anything, at least in a practical sense. You can’t be friends with someone who simply doesn’t want to be friends with you, and he doesn’t see why they need to go out of their way to accommodating her because she had a tough past. They’ve all had tough pasts.
But that last point is the hole in Ranta’s logic: they’re not so different from Mary, so they can find a way to connect. They lost Manato, their leader, but Mary left a part of herself down in the caverns where her friends were killed. Haruhiro and the others managed to pull out of a similar tailspin because they were still together, and were able to work through the pain.
Shinohara and Hayashi also live with the pain of losing friends they cared about, but didn’t realize until they were gone that they had to treasure those bonds while they were still around. When Haruhiro hears Ranta’s grievanes about always being dismissed or ignored, he listens and takes it to heart: Mary isn’t the only one he hasn’t been attentive to.
After the party tentatively agrees that they’re all friends, and that they should embrace Mary as one as well, it all comes down to execution. Haru is clearly apprehensive about the conversation; so much so Yume has to jump on him so he doesn’t reveal their position to a goblin (albeit one who has his dagger). By the way, I liked how Yume acted to protect Haru, their leader, from his own emotional desire to get back what he lost, since a dagger is far easier replaced than a comrade.
When Haru asks to speak to Mary, she seems resigned to the fact he’s about to kick her out, just as she’s left so many other party’s after her trauma. There’s the underlying feeling she’s contributing all she thinks she can, but it isn’t enough, and that frustrates her. She’s trying to find the Mary she left behind.
Obviously, Haru doesn’t want her to leave. Instead of pry into her past, he gives her the past of their party, painful as it is. He tells her how important Manato was and how hopeless things seemed without him. He admits he agreed to her joining the party because they needed a priest to survive, period.
But now, after some time, he’s decided, and all the others agree, that she’s become more than a hired hand. She’s become a valued friend, one he wishes to cherish as much as all his other comrades. Shihoru, Yume and Moguzo share the same feelings. And yes, even Ranta relents, buying into the generous atmosphere in the room – leading to one of present-day Mary’s most expressive looks.
Now that Mary knows the score, and knows that her new comrades also carry pain with them every day, she softens a little more. She doesn’t join them in shopping for Moguzo’s helmet, or any of several subsequent meals, but not because she doesn’t want to, but because she’s easing into a new situation. “Not yet”, she says, which isn’t “no”.
Like all things in Grimgar, Mary’s coming-around takes time, not because the show is stalling, but because such things take time in real life. It’s great that they think of her as a friend, but she still needs to process that and figure out how to have friends again.
Haru takes the party out to fight goblins in the city ruins day after day, creating a strict routine. Each time they go out, they get a little better as individuals and as a team, and rather than spend on better accommodations, they invest in better equipment. Soon, Haru notices it’s getting easier to kill goblins – the spot where he needs to cut is now lighting up in his head.
Repetition strengthening muscle memory, and increasing the efficiency of his motions. They make the most of their newfound skills, and fill each other’s shortcomings. They also include Mary in on their downtime chatter, including Ranta tactlessly asking Mary which guy she prefers (she doesn’t answer).
After taking things one day at a time for many days, Mary finally agrees to come to the tavern, and it’s a wonderful moment to see her in the middle of the party, sharing in the glow of the fire. Shinohara and Hayashi are also relieved to see her finally looking like she belongs in a party.
Before long, the time comes when it looks like Mary is going to move in with the others. On the last night she’s on her own, Haru is out in the courtyard, where Manato comes to him once more, likening the excitement and anticipation Haru feels to the night before a field trip (a rare look into their unknown past lives).
I don’t see Ghost Manato as a real ghost physically there, but the memory of Manato who appears when Haru is alone with nothing but the calm of night and the crackle of the fire nearby. But that doesn’t lesson his importance as a presence Haru treats like Manato.
The new leader wants to show the old leader what kind of party they’ve become. Other tavern patrons may be half-mocking in calling them the Goblin Slayers, but it’s a name Haru intends to wear with pride.