Ace, Deuce, Grim, and Yuuken meet up with Cater at the Heartslabyul entrance. Cater informs them that they have dressed in their formal attires since the Queen's decrees are absolute. Ace and Deuce felt shame since they can't grab their attires at their dorms. Luckily for them, Cater decides to dress them in their dorm attire on the house by using his magic. Everyone except Yuuken is dressed in Heartslabyul dorm attires. Cater thinks Yuuken is fine with what he is currently wearing and Yuuken says it's the best suit from his original world. As they arrive at the Tea Garden, Ace notices more members have been collared and Cater says it's a long story. The Heartslabyul traditional Un-birthday party starts as an unnamed member announced their dorm leader's arrival. Riddle asks Trey if he was careful to include the dormouse in the teapot, and he responds politely he did. Riddle proposes a toast before their croquet match, he entrusts everyone to have their teacup ready and celebrated someone's unbirthday.
Cater encourage Ace to give the mont blanc to Riddle. Ace approach Riddle and apologizes to him for eating the tart from the other day and bakes him a new one. Riddle asks Ace what kind of tart he made. Ace shows him the mont blanc to Riddle, hoping he would be happy to see it. However, Riddle is very offended and found it unbelievable. Riddle yells at Ace not only for breaking a serious rule but also ruined their perfectly unbirthday day. He reveals one of the rules, number 562: "Do not bring mont blanc to an Unbirthday Tea Party". When Deuce asks Riddle how many rules are, he says there are 810 rules. Trey and Cater, who helped Ace and the others, weren't aware of that rule and didn't know about it. Riddle declares as Heartslabyul dorm leader, who respect the Queen of Heart's rules, can't let go of this rule-breaking. He orders Ace to discard the mont blanc, but he refuses because he makes zero sense. Grim agrees with him and asks him if he can eat it if he's gonna toss it. Trey and Cater try to take the blame for Ace since they didn't know about the rule either. Riddle ignores them and mainly focuses on the tart Ace brought to the Unbirthday party and thinks it is the source of the problem. Yuuken steps in and asks if they have to follow that rule because nobody was bothered by it. Ace calls Riddle an idiot for following that system which results in Riddle getting angry. Cater panicked and begged Ace to stop saying that language. Ace decides to stand up to Riddle for getting serious over a single tart and he's full of it. Deuce agrees with Ace because rules are meant to be followed, but this is getting way out of hand. Riddle angrily tells them the smallest rule gives rise to bigger issues. Ace tries to ask the other Heartslabyul members to tell him how they felt about Riddle treated them, but they are too scared to stand up. Instead, they lied to Riddle that they rely on him for his impeccable judgment. This makes Ace disgusted and calls them cowards and finds it lame. Riddle states that in his year as dorm leader, there haven't been any dorm members who repeated a year or faced expulsion. He claims he's right and not only he's the best student in his dorm, but he is also the strongest. He orders them to follow him without protest. He calls them rule-breakers who are the ones in the wrong and declare he will off with their heads. Cater begged Ace and the others to follow their rules and says, "Yes, dorm leader!", but they refused to obey him. When Grim insults Riddle for being a selfish tyrant who's wasting all the food, Riddle snapped and his magic started to corrupt further. He uses his unique magic on Deuce, Grim, and Yuuken in an enraged fit. Riddle orders Trey and Cater to throw them out this instant. Trey and Cater are forced to listen to Riddle's commands and do what he says.
After Cater and Trey throw them out of Heartslabyul, Trey tells Ace and Deuce they will try to convince Riddle to let them back with another apology. Back at the Unbirthday party, Riddle cheerfully declares to collect themselves and continue where they left off and prepare their croquet tournament today. Unknowingly to Riddle, he fails to notice his staff magic gem is starting to spread. As the dorm members remain silent, Cater asks Trey if he's sure this is alright with him. Trey sadly responds there's nothing he can do to stop him now.