A third-year at Cocona's school, and a member of the art club. Iroha paints many great art pieces, which Cocona sometimes is in awe of. She also believes that she doesn't deserve to wear nail polish, due to her past.
When Iroha was a kid, her parents were always fighting, so she'd visit her grandma's place often. During that time, she made a promise with her grandma, which she failed to keep, leading her to regret it. After Papika and Cocona keep up on the promise in Pure Imagination, Iroha's personality changes and she begins to wear nail polish.