During and school trip, the bus of the 2nd year class 3 with 32 people was summoned to another world... we were gonna be sold to become pilots of robot like magical weapons, but it looks like the values of the selling prices were decided by the values of some unknown parameter called Ludia (ルーディア)... While some classmates got high prices with parameters of 10,000 or 20,000, my parameters were actually 2... really unbelievable... but actually my parameter's value made the measuring machine's needle perform a full turn but no one noticed it... Though I had the strongest parameters... nobody bought me and was actually exchanged as an slave for two fruits.

*Note: Includes 2 extra chapters.*

Leon is the kingdom's most worthless Court Magician. One day, his repeated absences are punished and he is sent to the battlefield, but with the quick wits he was hiding he saved the Third Princess Sicily? Then, along with the reformer princess, and steeling his own resolve, Leon becomes a specialized officer determined to control events from the shadows.

As the first prince of my country, I returned to the royal capital for the first time in 10 years after my father, the king, fell ill. When I arrived, I was met with a sight my eyes couldn't believe. The main streets were deserted, the shops were empty, and the fields were overgrown and completely abandoned. After investigating, I discovered that the nobles had apparently started a rebellion. If things continued as they were, the country would be destroyed during my generation...even though I was in a position where I could live in luxury! I would definitely rebuild this country! First, I would gather together the best people. Even if that person was the Demon King... The greatest prince in history? The savior of the kingdom? I was simply making money for myself, but... (Source: Futabasha, translated)

I was working for a black company when I collapsed from exhaustion and woke up to find that I had been reincarnated as the son of a weak lord in another world. I was attacked by a demon, lost my parents, and took over a territory that no longer had any residents... The path I chose to survive was to gather people under extremely white conditions! This is a territory management fantasy that starts with no residents!

On the day Aria, the daughter of the Marquess, turned eight years old, she regained her memories of being Saintess Esta, one of the Four Saints who defeated the Demon King 1,000 years ago. Aria is thankful to God and happy for her new life, that is until she realizes that for some reason she was born with the ring of her comrade-in-arms in her previous life, Prince William ...