Izumi is a shy and naive monk, with little experience in the outside world.
Due to her upbringing in a mostly single sex enviroment, she has trouble talking with boys to begin with.
She's very methodical and kind, always thinking things through, even if this causes her to panic over little details.
Her key relationship is to her sister, Natsumi, who's impulsive nature causes her no end of grief and stress.

Her key development revolves around her low sef-esteem and attepts to better herself, so that others don't need to look after her.