Keiichi Iwase (岩瀬啓一 Iwase Keiichi) is a college student and regular customer at the cafe "Rainy Color".
He has bluish-black hair and deep rich cobalt blue. He is usually seen wearing a dark blue blazer with a white undershirt and gray pants.
He is a no-nonsense guy and in Ryouta's word, 'cold-hearted'. He is not good with words and is not too social. He is a decent and good-natured guy and is very affectionate towards Rain, the dog of the owner of the cafe "Rainy Color". He likes drawing and painting.