Kuro's new beginning

"How could you? How could you? How could you?" Such was the thought of Tomoka as she sees Kuro leaving the town with the Queen of the enemy kingdom. Then she yells at Kuro saying: HOW COULD YOU KURO? HOW COULD YOU? Kuro turned his face towards her and gave her a look before leaving Thesaurussia for good.
Through the magical portal, Kuro arrived at the kingdom of Eglatine in less than an hour. The guards raised up their weapons to attack him but the Queen in his arm and the crown on his head made them bow to him. A guard announced the Queen's death and the new king to everyone, people weren't pleased to see their kingdom being ruled by a stranger who knows nothing about the kingdom of Eglatine and truth be told, Kuro knows nothing about the kingdom of Eglatine. His was fed then taken to his new room to rest, tomorrow will be a long day.
Meanwhile at the kingdom of Thesaurussia, the King put a bounty on the head of Kuro, whoever brings the head of the traitor will receive a million morale which is the equivalent of 10 million yen. Such money means a lot to the people of the kingdom of Thesaurussia, it could solve dept, bring one out of poverty or even help in investing into business. So anyone, anyone could be the reason Kuro enters his early grave.
Kuro woke up to the voice of the Queen's spirit waking him up.

Queen: are you ready to rule Eglatine?

Kuro: this is five o'clock why are you waking me up so early?

Queen : how can you sleep when your life and the life of your people is at stake?

Kuro: a body that hasn't fully recovered can't make rational decisions, come back at nine o'clock okay? Thanks.

Queen: my soul can only visit you once a day and it lasts for an hour so let me tell you all you need to know about Eglatine.

Kuro: I promised to take care of your kingdom, I didn't say that I would reduce my sleep.

Queen: KURO!!! Take this matter seriously Please!!!

Kuro: your desires are orders. So tell me, what should I know about the kingdom of Eglatine?

Queen: this kingdom uses the power of the animal kingdom, land, sea and air. As the ruler of Eglatine, you have the armour of the strongest one from each of these. Lion armour for the land, Eagle armour for the air and octopus armour for the sea.

Kuro: so, I have to rely on the ability of each animal armour I possess plus fighting skills?

Queen: exactly, you get it.

Kuro: no wonder Eglatine is the weakest kingdom in the entire world, I guess I should prepare my funeral instead of my future wedding.

Queen: Kurooo!! now is not the time for that, it's time you not only start training but understand the people to make them love you.

Kuro: your highness don't make me regret this decision. 

Queen: I won't Kuro.

Kuro spends his remaining sleeping time to learn how to master his first armour, the lion armour, which is easier said than done.

It's breakfast time, the maids prepared everything for him. It has been a while since Kuro eaten this well but he knows that this luxury will cost him his life and sanity.

Meanwhile in the kingdom of Desflore, the second weakest kingdom of the Agate world, the rulers of the land decided that the Queen's death is the best time to take over the kingdom of Eglatine. "So in two days, unexpected to anyone, we will strike them without mercy!" Those were the King's word before releasing the troops of earthquake towards them.

When the news broke down of their kingdom being under attack, everyone was terrified, Kuro included, he was not ready for such responsibility, he even thought of fleeing the kingdom. But with the promise he made, if the people of the kingdom of Eglatine dies, their blood will be upon his hands and conscious. "Why me?" he asks "why does it have to be me?" but mourning will not change his fate and save the people's soul, so he walked towards the people and says "fear not, I have made a vow, so ill fulfil it and protect you people until my time is up". "How?" The people asked, "How are you going to protect us?" Kuro answered them saying "the fruit of my labour will help you understand". The People had doubts but his confidence was kind of reassuring.

He gave instructions to his army saying "only the army of the air will fight this war with me". The guard captain protested saying "they are not enough, with them only, you'll fail to protect us, plus you haven't even finished learning how to fight with the lion armour, talk more about the Eagle one". Kuro answered him saying "the army's sent against us are of earthquake, the only one that won't be affected are the armies that flies, besides, I'll go with them even if it means that I won't fight". So the army of the air was set, Kuro transformed to his lion armour and accompanied them.
The army of earthquake was futile, they could not reach the army of the air who shot all the army not leaving anyone alive. Kuro did not fight the war, but his wisdom, encouragement and guidance brought victory to the kingdom of Eglatine.

The people hailed and praise the name of Kuro itoshi, a name that is a taboo for the kingdom of Thesaurussia. Kuro warned them saying "there is more to come, I'm not perfect and anyone of you can rule the kingdom better than me but I ask everyone of you to trust me and help me keep the kingdom of Eglatine out trouble". The people hailed him and at night everyone went for the Queen's funeral to mourn her and pay their respects to her.

But one Question is left unanswered, who and where is the person who caused the death of the Queen?