Mob kara Hajimaru Tansaku Eiyuutan

It is the story of a high school student, Kaito Takagi who wanted to become a great warrior. He spends his most of time finding dragons and slimes all over japan. He kills many slimes and gets extra cash. He has beautiful childhood friends who are quite popular in the whole school. In the search for more slime, he found a special golden skin slime, and after defeating him. He got a special card through which he can summon mythical begins. One day he decided to use it to change his ordinary life into a modern fantasy.