Based on the game by Haikuo-Soft. A story about the reunion of 4 childhood friends, Yuzuki, Matsuri, Nono and Makoto, in their deserted old school campus, Mochitsuki Academy. 3 years ago, they buried a time capsule under a tree inside the school and made a promise. A promise to meet again after exactly 3 years from that day. And the day of promise has finally arrived. (Source: AniDB)

Life hasn't been fair to Koyomi Morishita. Even though she's in high school, she's so short that everyone assumes she's still in grade school. The boys and girls in her school tease her mercilessly, and she's not exactly graceful either. On the other hand, she's still better off than Yumiko, who has a magician trying to kill her. Or at least Koyomi was until their paths crossed! Fortunately, salvation arrives in the form of master mage and graduate student Misa Anehara, who agrees to take Koyomi under her wing in learning the new style of magic, which breaks enchantment down into sequences of code. That'll be quite a task, given that so far Koyomi's talent seems to consist of making washbasins randomly fall out of the sky. But if it was easy, it wouldn't be magic, would it? (Source: Sentai Filmworks)

The story is told by the cat-eyed boy, hated by humans and demons, who engages in tales of terror, including monsters and children.

On the surface, Koudo Ikusei Senior High School is a utopia. The students enjoy an unparalleled amount of freedom, and it is ranked highly in Japan. However, the reality is less than ideal. Four classes, A through D, are ranked in order of merit, and only the top classes receive favorable treatment. Kiyotaka Ayanokouji is a student of Class D, where the school dumps its worst. There he meets the unsociable Suzune Horikita, who believes she was placed in Class D by mistake and desires to climb all the way to Class A, and the seemingly amicable class idol Kikyou Kushida, whose aim is to make as many friends as possible. While class membership is permanent, class rankings are not; students in lower ranked classes can rise in rankings if they score better than those in the top ones. Additionally, in Class D, there are no bars on what methods can be used to get ahead. In this cutthroat school, can they prevail against the odds and reach the top?