Kohei has been having recurring dreams lately in which he falls somewhere, and these dreams are reflected in his chronic insomnia. Therefore, he strolls around the school grounds every day, looking for a secluded place to take a nap during his lunch break. One day, for the first time ever, he visited the greenhouse on the roof and decided to take a nap there. When he woke up, there was a girl he didn't know sleeping next to him. "Wow!? Why?" "Well... this is my, reserved spot..." Yoake wasn't the most studious kid in school. And she never showed up to class, even if she came to school. Little by little, Kohei begins to learn her secret, in those times when they nap together.