The main character loses his life in an unfortunate accident on his way home from his part-time job, and is reincarnated as Alec, a baby in a fantasy world. Alec, who had a hard time being abandoned by his biological mother in his previous life, thinks about living freely this time, but he learns that he will be abandoned again in this life. Alec is intensely trained in magic with his cute younger sister Liz, who shares a common destiny with him! Even when he is left behind in a deep forest on a fateful day, he and Liz aim to escape using their mastered magic.The two little kids cross the forest and arrive at Hohenheim territory. He started an adventure with Mr. Jin, a kind young man who was passing by, and he did a great job saving the town from a horde of monsters! Meanwhile, an evil plan is underway at my parents' house...!?