Tsurumaki Kokoro is a bright and cheerful high school student known for her positive attitude and love for performing. As a member of the band Afterglow, she dreams of bringing happiness to everyone through her music. Despite her clumsiness, she always approaches challenges with enthusiasm and an unwavering belief in the power of cheer and friendship. Kokoro is also an avid collector of cute items, which reflects her youthful spirit. Her passion for singing and connecting with her friends drives her to continually improve and spread joy wherever she goes.