Sasame Mitsukuri is a 15-year-old third-year middle school student born on March 4 in Higashiomi City, Shiga Prefecture, placing her under the Pisces zodiac. She stands 152cm tall with vibrant pink hair and distinctive purple eyes.

Her personality combines a calm, collected demeanor with an intensely curious spirit that actively seeks unexpected events and trouble. Though she dislikes silence, Sasame maintains reliability and supportiveness toward friends, often revealing a mischievous sense of humor. She wears non-prescription glasses as a deliberate fashion choice, specifically selecting lensless frames for their style.

Sasame owns a pet crayfish affectionately nicknamed "Var-chan" or "V-chan," though its formal name is "Antonio Gonzales Almodovar." As a member of the idol unit Ongaku Shoujo, she represents the theme color purple (#790CE8). She frequently interacts with the group’s manager, Hanako Yamadagi, believing fun occurrences gravitate around Hanako. Their closeness manifests through Sasame’s deep understanding of her and playful invitations, such as proposing shared baths to "get naked and socialize."