Mysterious Grand Prize at the Beginning, Enter Another World Alone

I got a chance to win a lucky draw while shopping, but I didn't expect to win a mysterious grand prize. What skills were acquired. Travel to another world, hunt monsters, and save the princess. I pulled the lottery machine. "Oh! A rainbow-colored ball! This is the second time I've gotten a rainbow-colored ball!" "Hey, what's going on? There shouldn't be any rainbow-colored balls in this prize machine." The staff member was surprised when I showed him the rainbow-colored balls. "Sir, this is great!" "Awesome? What did I get?" "The overall strength has increased by 777 times!" This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.