Arcus came to Rustinell to top up on supplies; that’s still on his to-do list, but he has averted a plot to kill the crown prince of Lainur! The prince declares war on the treasonous Porque Nadar—and orders Arcus to fight by his side. Arcus never meant to get involved, but a monarch’s word is law. After all he’s been through, Arcus might be prepared for open warfare; regardless, there’s no place more dangerous to stand than in the shadow of the boy who would be king. Especially when you consider the royal family’s track record with close friends...

The Raythefts are an old, minor noble house defined by magical talent and martial service. When six-year-old Arcus Raytheft, firstborn son to the family, proves disappointingly inept at magic, he is stripped of his inheritance and written off by his parents. His adoptive sister Lecia still adores him, but as the new heir, she is forbidden to interact with anyone who might drag her down. But when one inheritance is lost, fate arranges another: Arcus remembers another life, in a world where science prevails and magic belongs to the realm of fiction. Suddenly endowed with the life experience of a grown man and pressed to find a purpose as his family turns against him, Arcus resolves to find a way to break the laws of magic and Raytheft tradition over his knee!

Arcus is still leveraging his otherworldly scientific knowledge to improve his magic. On hearing news that Lecia, his beloved sister, had been kidnapped, Arcus set off to rescue her, only to be thrown into the Holy Tower. There, he runs into an old friend...or rather, enemy. They say no one can escape the Tower, but if he doesn’t, there’s no telling what might happen to Lecia...

Drawing on knowledge gained from his dream of a second life in another world, Arcus created the aethometer: a device that measures the essence of all magic. Now, he is finally ready to present his revolutionary invention to his nation’s premier magicians and military leaders. With the circle of trust containing the device’s earthshaking implications cast wider, how will the aethometer move to change Arcus’ fate and the fate of the world itself? Others within the gentry are keeping a close eye on Arcus after his decisive actions on the marquess’ estate. Whether they are friend or foe remains to be seen—but subtle machinations rarely remain so for long when Arcus is involved.

In the harsh region known as the borderlands, humans must fight an endless battle against demi-human creatures that come at them relentlessly, intent on taking their land and their gods. A young boy named Kai, fighting to defend his village, sustains a life-threatening injury that causes him to regain memories from a past life. If you’re not a guardian bearer, it’s like you’re playing life on hard mode... Kai’s newfound knowledge gives him a new sense of the unfair “rule set” that governs the world around him. One thing is clear: For those without a god to serve as their guardian, life is a constant struggle for survival. Thus begins the epic tale of a young boy’s ascent into a vast world filled with magic, bloodshed, and mystery.

Kaito Sena's life hasn't exactly been easy. Unfortunately for him, death isn't about to get any better. Summoned by none other than Elisabeth Le Fanu, the "Torture Princess," Kaito has to choose what he wants for his second life-be her butler, or die a long, painful death by torture. What is he to do but become her servant...and help her eliminate the fourteen ranked demons wreaking havoc in the world! See the original light novel come to life in this gritty manga adaptation!

A new adventure awaits Allen as he enters the service of a noble! After climbing up the social ladder from serf to manservant, Allen now finds himself dragged around by the whims of the willful young lady of the house, Cecil Granvelle. Despite this, he is free to leave the city—and immerse himself in hunting monsters! As Allen meticulously grinds on goblins and orcs, both he and his Summons grow stronger by the day. At the same time, he begins to earn the trust of the members of House Granvelle with his diligent work ethic. Just as everything seems to be going well, however, the viscount overseeing the next fiefdom over seems to be up to something. As danger creeps toward Cecil, Allen declares, “I promised to protect you, Lady Cecil. And I keep my promises.” Going all out with his skills and Summons, Allen must resist evil and impending doom!