Having Seen Through Their Hearts, I Decided to Attack Them Ruthlessly.

Reincarnated into a different world where the use of magic is the basis of three major systems. Summoning type [card master], Skill type [Knight], Numerical monster [Mage]. However, Sal has learned from the hearts of others since he was a child that he is a loser and has no chance of transcendence. Through his miraculous mind-reading ability, Sal discovered many secrets about his family—— The foster sister is the daughter of a treasonous duke, the stepmother who is married is trying to gain family property, and the father is the illegitimate son of the previous king... After leaving the family, he discovered that the outside world was equally absurd. The conscientious second princess wants to rebel, but the long-awaited eldest princess is running out of time... It only took him a second to accept these facts. … It wasn't until one day that he accidentally discovered that this ability could not only read minds, but also see the hidden characteristics of cards! [Goblin Girl] Hidden Characteristics: Brood - Corrupted enemy cards, causing them to betray their masters and be used by me. [Destroying Witch] Hidden Characteristics: Eternal Darkness - Defeated cards cannot be resurrected and permanently absorb the enemy's attributes. … There is a change of power in the kingdom and civil strife is imminent. "Princes, generals and prime ministers, would you rather have the seed?" Thrall made up his mind: "It's my turn to achieve greater things than my father did." The girl's resentment came from behind: "Brother... Didn't you agree that we would never be separated for the rest of our lives?" Very good, let's start by escaping from the clutches of the yandere sister...