Ace, Deuce, Yuu, & Grimm Relationship Analysis
Before we got into this, I wanted to specify why I added Grimm in. Typically, when I see people talk about the relationship of any of the characters and Yuu, Grimm is never mentioned. Unless of course, they are referring to the relationship of Yuu and Grimm.
I think this is an oversight. Simply because Yuu and Grimm are quite literally a package deal. There are a few characters in the game you so rarely see without each other, Jamil & Kalim, Azul & the twins, these are examples of this. But you also see these characters on their own quite frequently. But Yuu and Grimm being separated from each other is abnormal.
I can only think of three examples where they are willingly away from each other. The first, being in Iida’s lab vignette where Grimm was sent by Ace and Yuu to go get snacks. But even then, Ace and Yuu weren’t far behind him. The second, when Yuu went to go talk to Malleus. Grimm was asleep during this, and even then - Yuu’s relationship with Malleus effects Malleus’s relationship with Grimm. Simply put, since Yuu has permission to call Malleus Tsunotaro, Grimm also has permission to call him Tsunotaro. And thirdly, when Grimm went to eat magic stones. Yuu wasn’t always aware Grimm was doing this and Grimm also kinda came off possessed during those times - which is another thing entirely to talk about, but the point still stands. Grimm and Yuu are rarely ever away from each other.
Which is why I included Grimm in this analysis, he is just as important to the relationship as Yuu is.
Now, moving on from that, let’s talk about Ace’s, Deuce’s, Yuu’s and Grimm’s relationship. They by far have one of the most unique relationships in the game. This is because we actually get to actively see their character growth throughout the game through the relationship.
They are the only group in the game that Yuu can say will be there to help them no matter what. Chapter four and six not standing simply because of the unique circumstances. But that doesn’t change the fact that Ace and Deuce wanted to help Grimm and Yuu, they just couldn’t get to them in time.
The other characters don’t do this. Typically, you’ll only see the character for their respective chapters and the following one. Chapter six is unique in that regard, but that seems to be the rule. Only, Ace and Deuce don’t follow this rule. They have been in every chapter, either in big or small ways.
Because of this, we get to see them grow as characters. We don’t get to really see this for other characters, but we can for Ace, Deuce, and Grimm.
In particular, I think Ace, Deuce, and Grimm are all effected by Yuu in a unique way. Yuu is described as “disgustingly nice” by some of the characters. And since they are villains, this isn’t surprising.
I think we see this “disgustingly nice” trait with Grimm the most. Keep in mind, Yuu took Grimm in. They could have kicked him out, or had Crowley kick him out once he showed up. Keep in mind, Grimm tried to burn Yuu alive on first meeting, and kept insulting and demeaning them second meeting because they didn’t have magic. It’s shown that Yuu feels sympathetic for Grimm, and that’s probably why they took him in, in a way.
Grimm treats Yuu as a henchmen but will get just as offended on Yuu’s behalf when something happens to them. And Ace has made a few comments on home screen, Ceremonial robes if memory serves, about how Grimm acts up the moment Yuu leaves. Grimm does cause Yuu a lot of trouble, but Yuu is known as a beast tamer because Grimm will only listen to Yuu. And I think that’s because Yuu is “disgustingly nice”. It’s kinda like, Grimm may give Yuu a hard time, but he’s the only one that can do that because that’s his henchmen.
Ace and Deuce do the same thing. They’ll give Yuu a hard time and cause trouble, but they are there for Yuu when Yuu needs help. They do this for each other as well. Considering these are the same people that had Yuu give them their lunch to help catch Grimm in the beginning, and they’ve now moved on to helping with much bigger things because they’re worried about Yuu says a lot about their character growth. And I think this is because Yuu is so “disgustingly nice”. Yuu hasn’t made the three of them better people, but Yuu has made them care more for their people.
And this concern isn’t centered around Yuu. It goes between all four of them. We see this in Endless Halloween with Ace. His vignette in particular. He knows Deuce is gone, so he goes to check Ramshackle to check if Yuu and Grimm are gone too. And when he finally gets them back, he’s angry because it was all just some big prank and he was worried something horrible happened to them. And he couldn’t even get mad because it was a prank pulled by the Malleus Draconia, and it was a big party for the ghosts.
This was the person that teased and poked fun at Grimm and Yuu in the beginning and tried to skip out on his punishment. This was the person that refused to work with the others and was content to get expelled. This was also the person that ran to Yuu because he knew they would at least let him stay at their dorm because they were so “disgustingly nice”. And this is the person that traveled a huge distance, spent and did who knows how much, just to get to Yuu and Grimm because they were in trouble. Him and Deuce didn’t even get to spend proper time with their families over break, because they immediately went to go help Yuu and Grimm.
Deuce was the person that got dragged into Yuu’s, Grimm’s, and Ace’s situation. Also refused to work with someone even though it could get him expelled. But he was also the person that went to check on Ace once he learned that something had happened. And even though Ace and Deuce both had times where they wanted something in exchange for their help, they went running to help both Yuu and Grimm once they knew they needed it.
Grimm is the person that didn’t have anyone before he came to NRC. And even then, the only person he had was Yuu. Yuu didn’t have anyone because they came to NRC and didn’t have anyone but Grimm. Ace and Deuce became people they could rely on. And Ace and Deuce could rely on them in turn.
Another thing is - spoilers - how Grimm, Ace, and Deuce are all helping Yuu get home in Chapter seven. All three will lose Yuu, who they care for deeply as a friend. Grimm in particular will be the most alone once Yuu leaves and there is no guarantee he can still be a student once Yuu leaves. But all three are still helping Yuu find a way home.
They have one of the clearest friendships in NRC. You know that they are friends. And I think this is because that they have one “non-villain” character that it’s so obvious that they are friends. Because while Ace, Deuce, and Grimm wouldn’t necessarily say that they are friends, Yuu would.
That’s not to say they don’t have their ups and downs. You notice this the most with Ace and Deuce. Ace teases Deuce a lot, and Deuce doesn’t appreciate it. While Ace teases people because he genuinely wants to make fun of them, he also does it to people he likes. It’s unclear on if Deuce knows this, but it does upset Deuce enough that he’ll go to the beach and scream about it. It’s also unclear on if Ace knows that it even bugs Deuce this much. It probably doesn’t help that the two can’t get away from each other, they share a dorm room. But they’re still friends.
People know that they’re still friends even when they frustrate each other, simply because if you can’t find the two with Grimm and Yuu, you can typically find them together.
Ace and Deuce are friends. Yuu and Grimm are friends. And while all four are friends, they do separate in that regard. But together they are a friendship group that cares about all of its members and will do anything for each other.
There’s an interesting phrase I’ve heard before. A hero would sacrifice you for the world, but a villain would sacrifice the world for you. I think this sums up the four’s relationship perfectly at the end of the day.


