This behavior is not manipulative in a malicious sense; it is tragic. Yukina is desperate to feel "normal." Her obsession with keeping Yuu close is a defense mechanism against the loneliness of being different.
The figure most prominently associated with the name Yukina Saeki is a Japanese adult video (AV) actress. She was born on August 24, 1993, in Tokyo, Japan. According to her profile, she is 175 cm tall with body measurements of 94-58-88 cm and a G-cup bra size. yukina saeki