The world of Yozakura Quartet is actually not one, but two worlds: one of humans, and one of youkai. Despite appearing mostly human, youkai may have animal like physical traits, along with a number of special abilities. Normally youkai are confined to their world, but some have found their way into the realm of humanity. As a symbol of peace, and a bridge between the two realms, a city was constructed within the protective barrier of seven magical trees, otherwise known as the Seven Pillars. This city of Sakurashin is home to both humans and youkai, with the peace between them maintained by the Hizumi Life Counseling Office. The director of this office is Akina Hiizumi, a teenager with the inherited family ability to perform “tuning,” which can send harmful youkai back to their world permanently. He is aided by a group of girls, including the town’s 16 year old youkai mayor, Hime Yarizakura, their town’s announcer and resident telepath, Ao Nanami, and Kotoha Isone, a half-youkai who can summon objects just by stating the object’s name. As new residents enter and mysterious events begin to take place, this quartet of protectors and their closest friends must continue to guard the city of Sakurashin, and maintain the fragile balance of peace between humans and youkai.

Shipped with special edition of Atto's spin-off manga , the OVA serves as the 13th episode of third anime season .

A mini-anime based off the mobile rhythm game "Project SEKAI: Colorful Stage."

Uzuki Shimamura is an aspiring student who dreams of being an idol. After failing her first audition, a producer from 346 Productions tells Uzuki that she has been chosen for the "Cinderella Project," a new idol group. The project, however, still lacks two other members, so the producer needs to scout suitable candidates. The producer's eyes fall upon Rin Shibuya, who is in the midst of an incident with an upset crowd. As the imposing producer defends her, the two of them are taken in for interrogation by the police, and released after some explanation. Taking this opportunity, he scouts Rin for the Cinderella Project, only to be rejected. Will the producer be able to find two more members for his idol group? [Written by MAL Rewrite]