I transmigrated in a novel as the daughter of a duke’s vassal who is the companion of the sick young master, whose lifespan is reduced every time he uses mana and is destined to die soon after being used as a ‘magical tool’. Even though the young duke has more mana than any other duke in the past, but people say he will die before he becomes an adult. “Young master. This is my daughter Hereis. Hereis, why don’t you greet the master?” Master Zenon, who has been neglected for a long time and has a bad personality and a father who tells me to become close with such a master. Furthermore, Zenon’s uncle, who is a villain, interferes in his affairs every time! For the sake of a peaceful life, Here's decides to protect the young master. “Don’t worry about that at all. I will somehow find a way and if the young master dies, I’ll follow him soon.” But somehow, the master seems to be more interested in other things than his own life. “You said you’re going to die after me.” Is this really what’s important now?