Papa

Natsuki's Papa (なつきのパパ Natsuki no Papa), known simply as "Papa" is the father of Shiraishi, and the ex-sugar daddy of Natsuki Mogi.

His full face is never shown, often being obscured or shadowed.

He drives a Mercedes-Benz (a W201 190E in the Manga, a E-Class W210 in the Anime, and an S-Class W220 and W140 in the 2005 Movie).

Biography
He was a salaryman who paid Natsuki to go out with him.

Relationships
Shiraishi

Biological daughter, she warned Takumi about Mogi and her father's relationship

Natsuki Mogi

The two were engaged in an enjo kōsai relationship for an unknown period of time, with him paying Mogi to spend time and be intimate with him. She ended her relationship in order to pursue Takumi Fujiwara.