This Person Is so Scary

A god from another world traveled back to a young boy and lost all his memory. He became an ordinary person who was afraid of being alone and had no great ambitions. So he met a girl who had a similar experience to his own. He made some interesting, good friends. He ushered in a more satisfactory life, and then—— They are all dead... [Ps: The only one who can defeat the evil dragon is the evil dragon. The title of the book is also called "This Evil Dragon is So Scary". It may make you depressed at first, but it will get better later.