I agree with the comments above. I don't know how trashy this series can be. It's really not that annoying for a first chapter but it has a lot of point that should not be happening for the writing to be better (even with the fact i read this 3 years late)
1. He wears uniform to the house, people should be mindful of their behaviour if they got stranger with proper uniform in their own house. Ask the guy first what was his business. I refuse to believe it's part of Japanese culture in real life.
2. The house is crumbling even though it's housing the most important students of the school?
3. Who actually would change clothes in a room near the front door? The house is wide.
Seriously i know fiction is necessarily in need of plot armor (illogical things) to make things happen just like what the author want. But the reader can tell how much the author cares to his own story by how he presented the story to the reader. Abusing plot armor is basically telling the reader you don't have plan to make the story unique