Kei and Roku who've been together since birth (twins) have been inseparable since then, Roku thought they'd made an unbreakable bond but there was something behind?
Shuuji a photography club decided to take a picture on a rooftop. But what he didn't know is that it's been closed off to the public due to a double-suicide that happened three years ago. Thinking that it was just an urban legend he head to the rooftop to find out that it was unlocked. What he found there changed his perspective about a classmate named Roku.
Sora o Daite Oyasumi