A girl with a taciturn personality who works as an information broker, following in her grandfather's footsteps. Her sources allow her to find information of all kinds, including new jobs for Shinkurō to help his livelihood. She has been Shinkurō's friend since childhood. After he lost his family, she tried, without success, to cheer him up. When Shinkurō was about to be killed, Ginko tried desperately to save him.

Because Shinkurō's job as a mediator leaves him covered in wounds, Ginko constantly offers him a job at her family's ramen shop where she works part-time. She hopes that Shinkurō will quit his job as a mediator and come work (and live) with her. Ginko also likes Shinkurō, but isn't as open with her feelings as other female characters. Even so, Ginko notably gets irritated whenever other girls, especially Yūno, flock around Shinkurō.