The MC was not dense or stupid

he was kinda have evil/bad personalites, and have sad past where her mother and him got in car accident in the winter(at that time it was a blizzard storm). They decided to hide in the cabin waiting for help. The help comes but the mother die(got freezed in cold winter) hugging the MC.

Mc then got into dream where he told his mother he will play outside. There, sleeping in train tracks when the train come, for dare or not challenge with his friends. He then violenty asked the 1000 dollar for doing that crazy stunt when his friend hesitate to pay him (in the end the friend give the money), then after that he bump into a group of yakuza or thugs i guess. the thugs was mad and asking him to apologize but he then just beat them up all. In the end he say he was bored.

Suddenly he wake up from the dream and see the world was in chaos and remembered about her dead mother and realized it was just all dream.

There he meet a girl who wear ship clothing. The girl have "idiot" personalites and explain the MC the world have been invaded by alien thing called the sheep who abducted the human and put them in sleep at dream world where they got everything they desire. There's a rare case when the human dislike their dreams , the sheep released them because they are "scared" with people who does not have any desire.

In the end the MC say "fuu i don't care" and try to roam the world to kill time and search for the clue. Of course he dislike this sheep girl who also following her because he think this girl as alien and planning something.

It should be Drea-mer.

thanks