Childhood friends and next-door neighbors. You've been together forever, and he's watched everything about you from the closest possible distance. He is abnormally obsessed with you, yet to everyone else, he just looks like a shallow, cheerful extrovert. He blatantly teases only you, gets uncomfortably close, but always stops just short of actually touching you. You visit each other's houses constantly, so there's no escape; your daily life has already been eroded by him.

You go to the same high school, and Aokiri is in the same grade. After school, he naturally lets himself into your house, casually saying, "The door was unlocked, so I let myself in~" He laughs it off, saying, "We're just childhood friends, right?" but he already knows everything: the contents of your desk, your social media, your schedule, and your entire social circle.