Ein begins a new chapter of his life at the academy, where he’s forging friendships and honing his swordsmanship. Krone, too, is doing her best to become the crown prince’s ideal partner. But academy life isn’t all studies and school-day shenanigans! Ishtarica is soon besieged by malicious schemes and the terrifying Sea Dragon. Against everyone’s wishes, Ein decides to face the legendary beast head-on! With his new life and homeland in jeopardy, the boy-turned-prince is willing to put it all on the line!

Following a mysterious gacha pull, an unlucky soul is reborn into a fantastical world as the young Ein Roundheart. He possesses a skill that allows him to break down poisonous substances—which is nowhere near as cool as his little brother’s flashy combat skill! Ein does his best, but even so, his father and stepmother bypass him to proclaim their youngest son the heir to the household. And things only get more complicated from there. On the heels of a fateful encounter with a young girl named Krone, Ein and his mother are shunned by the family and decide to take refuge in her home kingdom...where Ein is suddenly declared the crown prince! This marks the beginning of a whole new life for Ein, and he’s out to prove that he’s worthy of the crown.

As Ein delves deeper into Ishtarica’s greatest secrets, he’s suddenly reminded of the legend Professor Oz once shared with him. The prince tries to connect these puzzle pieces when he receives a troubling report from across the ocean—Heim is gearing up to invade its neighbors while Euro has been overrun by mysterious creatures known as chimeras. Unable to let these heinous acts slide, Ein and the Ishtaricans quickly take action against Heim’s devious machinations. But while doing so, the crown prince comes face-to-face with a shocking revelation regarding his most trusted confidants. Can Ein save the world and destroy the roaming chimeras, even with the deck so stacked against him? And more importantly, can he find the strength to stand on the front lines of a grisly war in order to protect his loved ones?

Ein’s headed off to the Adventurer’s Town Barth for more info on the red foxes! Alongside his beloved advisor, the prince leaves to scope out the nearby Demon Castle. However, the boy quickly learns that his fox hunt is about to get rocky when a series of earthquakes shakes up his plans. In the hubbub, a primordial beast suddenly rears its head and it’s starving to exact revenge against the crown prince and royal family! If the first king couldn’t slay this ancient monster, what hope does Ein have? And just what is lurking within the shadows of the Demon Castle? The crown prince’s journey is nowhere near its end—it’s just getting started.

Ein reincarnated as a noble with the skill "Toxin Decomposition EX". The skill was not something he wanted, so he was disappointed...but then learns that he has a very rare talent to absorb magic power by eating magic stones. They even taste good! He then found out that his real identity was a prince of the largest kingdom of the continent. He was luckier than he thought! Now, with his loving, beautiful mother and clever fiancee at his side, Ein's quest to become the greatest King begins!

The shut-in Yuki Sakurai had received the first love letter of his life. This could certainly be called a miracle and for it to occur, it seemed he had used up all luck he had. Just shortly after reading the letter, he and his little sister Katsumi find themselves stuck inside a dungeon cell. Apparently their house had merged with a throne room of another world and the king was not amused for some reason. Genres of this light novel series include isekai, fantasy, romance, comedy, harem, game, action, ecchi, magic, school and demons.

Ein reincarnated as a noble with the skill "Toxin Decomposition EX". The skill was not something he wanted, so he was disappointed...but then learns that he has a very rare talent to absorb magic power by eating magic stones. They even taste good! He then found out that his real identity was a prince of the largest kingdom of the continent. He was luckier than he thought! Now, with his loving, beautiful mother and clever fiancee at his side, Ein's quest to become the greatest King begins!