Parallel world. Different world

Our MC, Rein, was walking toward his home after finishing his part-time work. As he walked, he unknowingly passed through an invisible gate that he couldn't see. Whether this was his mistake or not, you will find out by reading the novel to see what happened.

Please note that the cover is not mine; I randomly picked it from Google because it said it was free to use.

Also, English is not my first language, so there might be some grammatical errors.

Lastly, this is my first novel, so I don't know much about how to write a novel. Please feel free to criticize my work and let me know if there are any grammar mistakes.