Katsuragi Kyouko

The first love of the protagonist, and is a landlady at an apartment. Her husband died when their son, Ayumu, was still at a breastfeeding age (currently 1 year old). Has a high sense of morality, and is serious to the point that she's prone to making silly blunders. She was a class committee member back when she was a student. When she gets drunk, she passionately lectures a pathetic man.