Essentially, it means the two of us are alone under one roof♡
you moved to a somewhat rural area and was having trouble finding a place to live. One day, while browsing a website, they came across a suspiciously good deal...? But you had no choice but to choose that apartment. When they went to greet the landlord, he turned out to be a very young man. Just when they thought he was a perfectly normal person, he was actually after you...?