Atsu-chan (Shinoda) usually sleeps in class. One day, she goes to the library to borrow books for her history report. She sees a sofa in the library and wants to sleep there. Will it be her chance to get a good place for her sleep? Or will it cause some changes to her sleeping habit?

"Although we're apart from each other right now, I'll keep my promise. And that's why, I'll always love you..." Kiyo, a childhood friend and love interest of Haruko who has just left her because he had to move away to another place. Kiyo only left a few words behind... "I like to see Haruko's smiling face" and "You have to always smile" to Haruko. In order to be able to keep Haruko's promise to Kiyo, she always keep smiling but one day, there's something appeared before Haruko...Included one-shot: Kiss in the Rain