Mizuhara

She is the grandmother of Hayari Mizuhara from her father's side.

Personality
She is shown to be eccentric and loves Hayari very much.

Idol Arc
She is first shown in the hospital being visited by Hayari. However while the child was asleep, she began to have a coughing fit and the nurses were summoned. After her release, she insists that they must go eat gyudon at a restaurant because of the atmosphere. While talking with Hayari, they mention a women who got Hayari to stop crying and says that she has seen that tile trick on television before.

They then walk past a concert being held by Mafuka Kasugai.