Blitzing Timelines

My name is Satoru Mikami and well, just a while ago, I was your everyday normal guy. Then I got stabbed, died, and....came back to life as a slime in another world.Next thing I know, I befriend a lonely and melancholic dragon who's kinda a tsundere, building a town, meeting one of my destined ones and getting a human form!Said destined one is a kind person who has a freeloading lazy, swordsman of an older brother figure, a sadistic, poison-using, punch-happy chef of an older sister (who looks younger than her) and a cool ikemen father figure teacher!Though her teacher.....it seems like something's off about him, like I met him before... He reminds me of... Nah can't be, there's no way. There's no way that Aries-san and Veldora are the same people! I'm probably just out of my mind.(Aries smiles nearby)"Heh, don't you worry Rimuru. I'm going to make sure that you survive in this timeline. Not like in mine where I lost you. I'll make sure you live to see the future where everyone is happy. That's the only thing that I, can do as the only survivor of that hell"