What happened or the reaction of the whole World after the assassination spree by the DxD group was varied but not really varied from nation to nation. The United States of North American Continent or USNA for short. They should have sided with Japan because of their Alliance, instead the USNA condemned Japan for assassinating the leaders of the Great Asian Union. They compared it to The Night of the Long Knives which if anyone is wandering is a series of assassinations or killing done by Hitler and his cronies against the political enemies of their Nazi party. However, they are not doing this out of good because they have an ulterior motive for this behavior.
USNA is not the only nation scolding and berating Japan. Both the Federation of India and Persia also known as the Indo-Persian Union (IPU) and the New Soviet Union also known as The Federal Republic of Soviets joined the pray and wanted to be in the moral high ground. However, deep down these two nations are happy or joyous at the predicament of GAU, especially IPU as they can now reclaim the disputed territory while the GAU is still scrambling to find a new leadership. NSU is just happy to maybe 'lend' a hand to their GAU ally to protect their land near both of their borders. To both of the nations, there's a far more important reason why they are condemning Japan and it's the same reason USNA.
The League of South-East Asian Nations also known as the South-East Asian League (SEAL) consists of Indonesia, Singapore, Philippines, Malaysia, Brunei, Cambodia, East Timor, New Guinea, Taiwan, and the Kingdom of Thailand. These nations or former nations have divided opinions on this matter. Singapore, Philippines, Indonesia, and Taiwan (SPIT's unofficial name for the Alliance) all agree or applaud Japan and The Three Families for retaliating against the Terror attack by GAU while the rest of the SEAL members are against what Japan did.
The reason for the SPIT to seemingly want to ally with Japan is that GAU are bullies and SPIT just wanted to go under the Bigger Bully. GAU also tried to invade Taiwan many times but luckily Philippines and Indonesia backed them up by sending soldiers, not magicians as they are precious weapons, and to the extent Singapore helped by sending money. Likewise, if any of the SPIT regions is getting bullied or invaded by GAU, the other SPIT will always be there for them. In short, SPIT wanted to break off with SEAL or maybe join forces with Japan and what Japan and GAU did was the right moment to do so. Why do they want to break off? Well, let's just say the SEAL minus SPIT are all chummy with GAU and they will be happy if the SPIT gets annexed by GAU as the latter will give them compensation like money or research material for cultivating magicians.
The upcoming leaders of GAU promised to retaliate by doing the same thing Japan did to their nation and if that's not enough, they'll gladly go to an all-out war. Seventy percent of the citizens bought it and they are happy to support the new leaders to make the GAU number one again.
However, the reminder thirty percent just wanted to lay low and some of them even wanted to do what SPIT did, aim for an Alliance with Japan asked them for help as they could see the NSU and IPU were getting rowdy because wanted to invade. The Leaders started eliminating citizens and officials with this kind of thought to give an example but they didn't know that this move just fueled the Pro-Japan Alliance to go against them.
The complaints of the other Nation fell on deaf ears to the Three Families as they scolded them back like a Daughter-in-law raising her voice to her Mother-in-law for intervening in how she ran her family. They just didn't scold those who they considered enemies. They also thanked nations/regions who supported them and promised they would help them if they needed help. They demanded that Kudou Retsu step down as the Chairman of the Magic Association which the old man gladly complied with as that was his plan to pay the price of what happened in 9SC.
The reaction of the Japanese Government to this is quite simple. They denied their involvement angrily and blamed the Three Families for this unfortunate event. The other members of the Ten Master Clan back the Japanese Government. They joined in and scolded the Three families for their savage behavior.
The victims of the GAU terror attack criticize the lack of decorum or sympathy of the Japanese government and the other members of the Ten Master Clans. The thing is the victims and families of the victims do not really need to do anything like that because the victims or the dead already got resurrected by Oreki after they all return from assassinating missions.
The Resurrection method of Oreki caught the attention of the 3 other powerful nations, especially the USNA and if the latter made a move against Japan to demand the resurrection spell from Oreki, then the IPU and NSU will also follow suit.
Oreki however does not think much about this 'Super' Nation eyeing his ability to resurrect the dead as he and his group are focused on the 9SC ending ball.
----
In a certain studio.
"I don't know what to talk about anymore after all that happened," Takamori the host of the show said with a sigh.
The guest host, Naoka the First High fanboy, and Takeru the Third High fanboy look at each other before saying.
"I know what you want to talk about because I, too wanted to rant a bit but I'll hold back as the producers will grill me if I let off some steam," Naoka said with a bitter smile.
"We don't really need to inject our opinion into the people of Japan because I think they have already decided which side they are going to join," Takeru said.
"You're right Takeru-san, the Citizen saw the injustice of the terror attack the GAU did to 9SC live on television" Takamori agreed while nodding but he soon realized that they unknowingly started talking about last night's event. He looks at the producer to see if the latter is upset but to his surprise, the producer gives him a sign to keep going.
"They are already voicing their dissatisfaction about the response of our government but I'm afraid that for their safety," Naoka said in worry.
Takeru chuckles before saying "My friend, This is Japan, not GAU or NSU, government won't do a thing to them but they'll find someone to blame for all the transgression."
"Instead of blaming themselves, they rather blame the three families which the people considered heroes," Naoka said with anger.
"And with the help of the other members of Ten Master Clans, they'll soon pressure them to step down from TMC and give up some of their power over business or worse..." Takamori added.
"Imprison their mages? Unlikely but they can try" Takeru said.
"Or demand the Yotsuba family the miracle magic that Kamisato-san had used to be given to TMC and the Government," Takamori said.
"The Yotsuba won't bend their asses that easily especially with the support of Saegusa and Kudou." Naoka sneer.
"And if they do?" Takamori questioned.
"Then I hope these bastards don't give the spell to other nations," Naoka said.
The Trio of hosts looked at each other before laughing bitterly because they know that the Government would easily give it to other nation as current leaders are bunch of pushovers.
"Anyway, let's congratulate the Second High School for winning the 9SC this year" Takamori while clapping, the other two followed suit.
Takamori then looks at the camera with a serious face "Remember Citizens, standing up for yourself doesn't make you unkind—it makes you strong. Being a pushover might keep the peace temporarily, but true respect is earned when you value your own boundaries as much as you value others. Choose to be kind, but never at the expense of your self-worth." He then smiled and said
"And for that, from all of us here from the studio, I'm Takamori, stay classy Japan"