Who needs a cheat power when you can summon slimes? Powerslime

If you were to die and be given a second chance to life what would you like to bring there with you? Your memories? Your most precious possession? A cheat-like power? Or perhaps... an item that would enable you to summon the weakest monster in any fantasy setting, the slime? Our protagonist, Sora chose the last one. After screwing up his first life he might as well do the same with his second, or so he thought...