Roin was born lucky, and was forcibly invited to join the adventurers party by Guftok from the same village, who took advantage of this luck, but he was told that he would not be able to live up to his expectations and was unilaterally declared expelled, breaking his bones and eventually leaving him alone in the forest. It will be done. When Loin, who was in a desperate situation, achieved her first victory against the slime with her meager fighting power and a single wooden stick... a slime knife with a 5% appearance rate appeared! Not only did he have a lucky constitution, but he also had a guaranteed rare drop ability that guaranteed him to pick up rare items from defeated enemies. After safely returning to his hometown, he immediately defeats monsters with rare weapons and sells items to strengthen his arsenal. If it is necessary to treat his younger sister Clarices incurable disease in his hometown, he heads to a rocky mountain in the wilderness to defeat a monster bird. In this way, a miraculous unparalleled adventurer appears in the guild in the capital――!