一ノ瀬怜子
from The Perfect World of Kai
Reiko is Kai's mother. She works as a prostitute. In the manga: She likes the sea a lot, but she has never seen it so she named Kai after the name of "sea." She was born and raised at the Edge of the Forest, so no wonder she became a prostitute. She hates her work and guys too. She gave birth to Kai when she was 15, so in the beginning of the manga she is 25. She looks really young.

The Perfect World of Kai
A tranquil tale about two boys from very different upbringings. On one hand you have Kai, born as the son of a prostitute, who's been playing the abandoned piano in the forest near his home ever since he was young. And on the other you have Syuhei, practically breast-fed by the piano as the son of a family of prestigious pianists. Yet it is their common bond with the piano that eventually intertwines their paths in life. (Source: KEFI)