Shizuku is the former leader of the idol group Cheerful＊Days, specifically its 3rd generation. Her friend applied to the position for her without Shizuku's knowledge, but she decided to go with it after passing their audition and being awarded as the "Grand Prix winner". She trained to become an idol at the same time as Airi, who openly viewed her as a rival.

Eventually, her agency forced her to act out the image of a "perfect idol", leading to her being known among the fans for her beautiful, mysterious, and mature appearance. However, this caused jealousy from the other members of her group, who were forced to constantly back her up, which eventually led to them thinking that she has no special talent and is only popular for her looks. Her groupmates' resentment towards Shizuku built up even more due to her hectic schedule and her inability to prioritize Cheerful＊Days' activities.

One day, Shizuku meets Minori on the school rooftop, who she agrees to help train along with Airi. However, after increasing tensions in her idol group and an argument with Airi, she decides to leave Cheerful＊Days. Minori and Airi give her the hope to be an idol again, and after performing a show for Haruka in the Stage SEKAI, the four of them create MORE MORE JUMP!

Her mother is a koto instructor, and her father used to be the guitarist of a famous band.
Shizuku is part of the Miyamasuzaka credit course alongside Airi. As a second year, Shizuku was classmates with Airi in class 2-D, as well as a member of the beautification committee and archery club. She joined the archery club after being recommended to do so by a senior member of Cheerful＊Days. As a third year, she is classmates with Airi in class 3-E, and a member of the health committee and archery club.