My neighbor, Mai-chan, lives next door. Both her parents work, so she's often alone. I'm also a loner, and I've gotten used to spending time alone. One day, when I came home, I found her sitting there. It seems she'd forgotten her keys. I thought it was dangerous for a girl to be alone outside, so I invited her over. At first, she was reluctant and cold, but as time went on, I started to enjoy our time together...