Strange Tales of Rules: a Thousand Days Traveling Through Another World

On the day when the protagonist was eighteen years old, he bought a lottery ticket and won a grand prize of five million. Just when the protagonist happily went to receive the award, he was unexpectedly hit by a car and died. So the protagonist travels to a different world full of strange rules. As long as he can live in this different world for a thousand days, he can be reborn in the original world. So the protagonist starts his own journey to another world... This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.