Isekai Adventure3

My, my, the world's greatest assassin has been killed by his own organization. the goddess walks toward you and stands in front of you I'll give you another chance at life, but in return I want you to assassinate the hero. He's currently not in the world I'm going to reincarnate you in and that's because I want you to prepare. After the hero defeats the Demon Lord, he'll be corrupted by all the praise and use his status to his advantage.