Shiraishi Keiko♀

Keiko is a nurse at a local hospital and Marika's senior at work. She's a married woman and a mother, older that Hisahiro. She lives in the apartment on the right from Hisahiro's apartment. She's an obliging person, and because Hisahiro lives alone, she always worries about his well-being.
Every once in a while she gives him food she cooked herself, though they are mostly leftovers.