Perfecting extreme long distance teleporting would definitely grab some attention but not like this. Rimuru has been asked as a result of his new ritual for teleportation, by Yuuki kagaruzaka to try and alter his new ritual to see if they are able to send the summoned children back to their world from where they came...
You never had what was considered a 'normal' family, you was always treated as an outcast. The smallest of things would grant you an unpleasant experience. One day you had enough and decided to leave your so called family. And try to find your own way. It didn't work out so well since you was stabbed by a group of mug...