I'm not sure, but is the MC pretty dumb(though that would make the author dumb also)? Yes, he has to go out through the balcony to get out of his apartment, but why doesn't he just go back through the front door to get back inside instead of the balcony again? Though he is on the first floor...
I kind of forgot about this arc because it was never animated and the last time I actually looked through my copies of the manga was probably 10+ years ago.