|Debut||Never Back Down On Love|
|Japanese Voice||Yui Ogura|
|English Voice||Lindsay Seidel|
Sumika Izumino (泉乃 純花 Izumino Sumika) was Kureha Tsubaki's classmate/friend/(former) lover who was killed by Mitsuko Yurizono and her refusal to exclude Kureha along with the rest of the Invisible Storm, a group of schoolgirls who exclude those who do not follow social cues that they consider evil, gets her excluded as well. Sumika is eaten by Mitsuko early on in the story, with Mitsuko stealing her glasses as a souvenir. Later, she appears before Kureha as Lady Kumaria to turn Kureha into a bear and send Kureha and Ginko Yurishiro on a journey beyond severance.
In the manga, Sumika is a girl with a collection of stuffed bears who has romantic feelings for Kureha, but decides to stay her friend and aids her in helping Ginko. She is rumored to be an alleged "bear witch" who summons the souls of the dead to create living bears. When Lulu visits her, she uses some form a magic to allow Lulu to make her peace with Milne.
Sumika has short curly black hair pulled away from her face with hair clips that also match clips she has on her glasses. She has dark gray eyes and short bangs
Sumika is shown to be a extremely kind and strong-willed girl who refuses to either give up on her love for Kureha Tsubaki or give in to the Invisible Storm.
- The name Sumika means "pure, clean, simple" (純) (sumi) and "flower, blossom" (花) (ka).
- Sumika's surname Izumino means "spring, fountain" (泉) (izumi) and "from" (乃) (no).