An Shiraishi

Azusawa Kohane gets lost in the streets while trying to purchase a CD for her mom, stumbling upon Shiraishi An and her fellow musicians performing inside Weekend Garage's backstage area. Though captivated by their singing, she runs away out of shyness when confronted by An. After coming back a week later, An still remembers Kohane and performs for her, also inviting the girl to sing. An realizes the potential Kohane has when singing, inviting her to form a band in her dream to surpass a legendary music event dubbed RAD WEEKEND. She agrees, thus forming their duo group, Vivids. They also happen to meet BAD DOGS, Shinonome Akito and Aoyagi Toya, on the same day.

Akito invites Kohane and An to attend an event, and both girls accept the offer. While forming a set list of songs in a playlist, Kohane discovers the song "Untitled." Upon attempting to download the song, An and Kohane get transported to SEKAI where they are greeted by Hatsune Miku and MEIKO. With the help of the VIRTUAL SINGERS, the Vivids and BAD DOGS join forces to create Vivid BAD SQUAD and surpass RAD WEEKEND.

In the Walk on and on event, it's revealed that Akito and An make the songs performed at their unit's events, with Toya joining their process in the event. One of them will come up with an idea, create a demo based off of it, and then discuss what they came up with later and make adjustments. An example of their creative process can be seen in An's Nuanced Language side story.

An is a cool and candid girl with an unyielding spirit. She acts very affectionate towards her close friends, and is very kind and forgiving. She leaves a strong impression on others and is hard to forget. An encourages those around her to be the best they can. However, her and Akito often bicker due to their long-standing rivalry.

When An is part of the disciplinary committee at Kamiyama, she gets nervous when asking someone to follow the rules, getting shaky and stuttering when asking someone to tuck in their shirt.[4]

An has amber eyes and long, waist-length black hair with blue tips, worn loose with little star accessories. She takes out her earrings and star accessories during school.[4] Her voice is strong and radiant.

An is the daughter of the popular former musician Shiraishi Ken, who now owns a popular live cafe & bar called WEEKEND GARAGE, where she sometimes worked until the end of On Your Feet. An hopes to one day surpass the legendary event he put on, called RAD WEEKEND. She has been surrounded by music ever since she was young, and began singing partially because she felt a natural connection to it, and partially because she wanted to be like her dad.[1] She has a lot of connections in the street music scene, due to being Ken's daughter.

When Kohane came back to WEEKEND GARAGE after hearing An sing there, An invited Kohane to form a group with her, calling themselves Vivids. After some rivalry and conflict, they join Akito and Toya of BAD DOGS to become Vivid BAD SQUAD, though she and Kohane are still active as Vivids.

In her first year, An was classmates with Mizuki in class 1-A. In her second year, she is classmates with Akito and Nene. She is a member of the disciplinary committee, joining because a friend from middle school kept bugging her to.[2]. She also occasionally helps out the basketball team by being a stand-in for them,[3] an interest she shares with her childhood friend Haruka.