Uranohoshi Girls' High School, a private school in the seaside neighborhood of Uchiura at Numazu city, Shizuoka prefecture. A small high school in a corner of Suruga Bay, it is home to nine teens, led by second-year student Chika Takami, driven by one seriously big dream: To become the next generation of bright, sparkling "school idols"! As long as we don't give up, any dream can come true... All we have to do now is keep pushing hard for fame and glory! Now their "School Idol Project" begins to make their dreams come true! (Source: Official Site)

Love Live! School idol diary is a collection of side stories that happen concurrently alongside the TV anime's events! With each new story told from the point of view of a different member of the beloved idol group μ's, who knows what to expect!? Come along once again to Otonokizaka High, and experience all-new never before seen stories about the legendary school idols!

Rikuto had a new younger brother Ayumu after his father’s remarriage. However, little did he know that Ayumu was actually a girl and it was under her mother’s orders that she pretend to be a boy to him. Every day, his heart beats a little faster around his overly cute brother (sister), while her heart aches in having to hide her true identity from her kind brother. With the arrival of spring, Rikuto and Ayumu begin attending the popular private school Asaoka Academy, with Ayumu dressed up as a girl. As Rikuto becomes friends with his classmates, he notices that they all have something missing. His friend from middle school, Matsuri, has lost sight of what it meant to be a girl. The cool-mannered Mao dresses as a boy even though she is a girl. The extremely shy class rep Kimika wishes to change herself. With Ayumu by his side, he sets out to help them seek out what they are missing.

Picks up four months after the end of the first season and covers the events of the Visitor Arc in line with season two of the anime.