Yui Shiromaru

Yui Shiromaru (白丸 結, Shiromaru Yui) is the Astronomy Club Adviser.

Appearance
Yui has short, ash-gray hair and black eyes. She is mostly seen wearing her work outfit: a black belt choker, a red-striped white-colored t-shirt underneath a light cream-colored, shoulder-length hoodie, yellow clogs, and a black apron with the logo of the arcade she manages printed at its center.

Personality
Yui lives life at her own pace and is often shy when people come too physically close to her. Although she was described by Ganta as being "self-centered" due to her tendency to move at her own pace, it is shown that she puts careful thought into those around her, such as cooking food for Ganta and Isaki when they visited her home for advice and continuing to aid them in their endeavor to bring the Astronomy Club back to life. Before meeting Ganta and Isaki, she'd always spent time with herself, as shown when she was the only member of the Astronomy Club back when she was a student at Kuyou High School. Because she was the only member of the club, when she'd left, nobody was there to take over the club, inadvertently causing the observatory to be used as a storage room instead, until Ganta and Isaki brought the club back to life.

Etymology

 * She likes crabs (Chapter 83)
 * The name Yui means "tie, bind" (結).
 * Yui's surname Shiromaru means "white circle" (白丸).