Rina Yunoki

A clumsy but gentle and well-meaning girl in the same school year as the protagonist. She likes cooking and is the lone member of the cooking research society.

Her “arc” is in episode 11.

She has a little sister called Erina. Due to age difference with her little sister, Rina says to Kazuya when people’s seeing them together, they think Rina and Erina are young mother and daughter.