Kasumi Hazuki (Hazuki Kasumi) is a first year college student at Meiji University, majoring in Economics. She is Natsuo Fujii's next door neighbor at his apartment and an acquaintance of Misaki Ogura.
Kasumi is an attractive young woman (though supposedly "average" by her neighbor's standards when comparing to girls in prostitution)
Kasumi is originally from Shimane Prefecture who comes from a poor family that struggled to make it by. Her parents divorced when she was still young, leaving just her mother, little brother, little sister and herself. Her mother ran a bar, but barely managed to make ends meet and she had part time jobs to help with the house bills, but over time she saved up money for herself behind her mother's back. Frustrated of her living conditions, she used the money to enable herself to run away from home and start college in Tokyo. Although she's not fond of the apartment she lives in due to its deteriorating conditions, (as well as her loud and nosy neighbor) it's all she can afford.
While searching for a job, she was introduced by some acquaintances to work at a pink salon. It was there she ran into Natsuo Fujii again, who was dragged there by his club members. It was there that Natsuo understood her situation, then "bought" her for the day to help her find an alternative solution.
- The name Kasumi means "mist" (霞).
- It can also mean "flower, blossom" (花) (ka) and "clear, pure" (澄) (sumi).
- Kasumi's surname Hazuki means "month of leaves" (葉月).
- The name Hazuki is is the traditional name for August.
- The the older form of it being 葉落ち月 (haochidzuki/haochizuki, はおちづき) which means "month of falling leaves."