She's a Cursed Child—born with immunity to disease but at a devastating cost. Her eyes were destroyed when her mother, who abandoned her early on, poured lead into them out of hatred for her natural red eyes. Now she supports herself and her younger sister by singing in the Tokyo Area's outer districts, wearing a sign that identifies her as a Cursed Child and hoping passersby will drop money into her pan.
When Tina Sprout and Rentarou Satomi passed through Tokyo Area, Tina noticed her singing. Despite her blindness, she had an uncanny ability to identify other Cursed Children just by feeling their faces. Rentarou gave her some money that day, though he made it clear she shouldn't come back.
Content compiled by AnimeList.moe from publicly available sources.