This chapter occured after chapter 2 in book 1, few days after celebratory day solution. There is a retcon.

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When Kamui summoned here, the Vallite King didn't know why on earth he was worthy the title of hero. While he saved the continent from Anankos, he didn't do it alone. In fact, he is suprised Scarlet wasn't here despite the heroic act she took for saving Kamui in cost of her life.

Summoner once explained that his divine relic summons heroes randomly which is a bummer for the King. While far away from home, he can still at least visit his personal castle and his wife who are now pregnant.

Having surrounded by heroes around the world are not bad, but he miss everyone from his world. Everyone he met so far is stranger to him. He heard Takumi is here, but he still on a mission on Elibe. Which is grating, he doesn't have a chance speaking with his brother. It's feels lonely without anyone from his world.

Which brings him today to the summoning chamber. Where he hopes someone from his world can join him here. As he approaches the said chamber, he notices Princess Sharena and the Summoner just entered the room. Kamui hasten his steps and found them inside preparing the ritual.

The monolith in the middle is surrounded by many rural markings that stretches across the floor. With five colored orb recepticle placed to form octagon. Instead of five colored orbs, the Summoner places only one orb which the color is green.

"Pardon me for interrupting, why only one orb?" Kamui sheepishly asked, earning the attention of the Askrans. Suprisingly calm when the Vallite comes out of nowhere asking.

"Ah, King Kamui. You see, the Summoner always do his summoning magic thingy with five colored orbs, right?" Sharena replied with question.

"Er, yes," Kamui shot back.

"Did you know his magic requires his life force to work? Yeah, I was freaked out when he passed out during the summoning. So, to conserve orbs and to conserve his energy he only use one." Sharena clasped, waiting for the King's response.

"So, this divine relic what does it do beside summoning heroes?"

"That's easy, it shoots something, er-" Sharena leans to Summoner, asking him regarding Kamui's question. "Yeah, bullets! That's what thr Summoner said. I've seen it though, and it's amazing. Ever seen an arrow that travels so quick it always on target?"

"No, I never seen one." Kamui replied. "But it uses his life force too, am I correct?"

Sharena looks down. "Yeah... it's too risky to bring him to battle. Commander told him just to use it when it's emergency, but hey, look at the bright side, he brings us together here right now."

"True, I'm grateful to be here even if homesick started to get me. I just... miss my siblings."

"Aww, that's bad. I hope Kiran can bring them here. It's nice to meet some new heroes!"

"Yeah, I hope so."

As in cue, the Summoner, who was patiently waits for his companions to finish their chat then rises up.

Kiran raises the Breidablik, the light on the monolith's center lights up with green. Surge of power surrounds the chamber as it circles the green orb placed on the ground. With a trigger on the divine relic, it fires rays of light onto the orb.

Streams of light then came, blinding the occupants of the chamber. As soon it is done, it reveals the new summoned hero.

Kamui's eyes widen, he didn't believe it. She's here! One of his siblings. That Iliac hair and the voluptuous figure cannot be mistaken.

"Oh my, it seems someone's been naughty for bringing me here."

Kamui runs towards the hero and embraces her. "Camilla!"

The hero, for some reason taken aback by this, perplexed, to say at least.

"I can't believe it was this sooner, sister!" sadly, Kamui's excitement vanished the moment Camilla opens her mouth.

"Who are you?"

"Eh? It's me Kam—Corrin!"

"Corrin? Oh dear, someone has bewitched you! Tell me now, dear. Who is it? The one who turns you into a man, hmm, a dashing one too." Camilla raises her axe towards the Askrans. "Is it them?"

"Wha— No! I'm not witched! I am man since I born." says Kamui who are trying to restrain his sister.

"Speak no more, dear. I will find whoever did this to you!" Camilla ignores Kamui's plea

Sharen then steps in. "Um, I don't to ruin the family reunion, but I will explain," she continues, "Ahem! We are Askr Order of Heroes. You can think of us as the general do-gooders, well wishers and all around saviors of the multiverse!"

Kiran snorted, earning a glare from Sharena.

"Multiverse, you say, that means..." Camilla looks down to his brother. "You are different version of my sister."

"I think I am, but I'm glad I could still meet you, I really am." Kamui said.

"If this multiverse business is true..." Camilla quietly said. "I have one question first, what happens to our neighboring Hoshido?" Camilla suddenly asked.

"Why? We are united, right? Nohr and Hoshido. We fought my true father, Anankos, and won."

"Oh my, this is harder than I expected,"

"Wha—?!" Camilla pressed her finger on Kamui's lips.

"We continue this conversation latter, dear. We are being very rude to our hosts. My apologies...?"

Sharena piped up. "I am Sharena! And this is the Summoner, Kiran."

"Summoner... intriguing. I wish to speak to you later. For now, I wish to be given a tour to the castle. I want to know everything."

"Right away, Follow me!" chirped Sharena.

Later that day, the Vallite King knew the horrible truth about his sister's world.