Hanamaru Tokiko

The fourth sister.

She was a secretary to the protagonist's father who lives abroad. She is full of mysteries.

She is an older sister the protagonist does not feel at home with, her atmosphere is very different from the others. Her speech is very mechanical and does not match her flamboyant appearance. She often tells stories that don't make sense.

Spoiler

She is an android sent from the future, programmed to serve the protagonist.