The keyboardist for Glitter*Green. She and the other band members were part of the Hanasakigawa Girls' High School student council, with Nanana as the student council president.

She wears glasses, but removes them when performing.

(Source: BanG Dream! Wikia, edited)

Kasumi Toyama was enthralled by the stars as a young girl, so when she discovers a trail of star-shaped signs one day after transferring to a new school, she can't help but follow them. They lead her to a shop run by the grandmother of one of her new classmates, and Kasumi finds something that will change her life forever: a star-shaped guitar! And just like that, Kasumi knows that forming a band is her destiny. 
 
Of course, convincing Arisa and her grandmother to sell her the guitar won't be easy, and finding a group of other girls who want to become musicians will be even harder. But when a girl has stars in her eyes and a starbeat in her heart, there's nothing that will stop Kasumi from making her fantasies come true! 

(Source: Sentai Filmworks)


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The second season of BanG Dream!. 
 
It's a new school year and Kasumi, Arisa, Saaya, Tae, and Rimi are thrilled to finally be second-year students. Even more exciting than becoming upperclassmen, however, is the fun they have while performing in their band Poppin' Party… until things get out of control when the girls publicly announce that they're going to do their own concert before they've really studied the issue. 
 
Suddenly they're committed to doing something that's a lot more difficult than it seemed, and the pressure is doubled since their musical rivals in Roselia, who've also announced a live concert, are way ahead of them in planning! But you can't stop the music, and with a little hard work and help from other groups and some talented newcomers, Poppin' Party fever will soon be popping up all over! 
 
(Source: Sentai Filmworks)

Nanana Wanibe