Joshikousei Kagishi Saki

Teshigawara Saki is a high school student living in Roppongi with her father and grandfather, both of whom have questionable behavior. Despite her normal appearance, she possesses a rare talent for unlocking any lock. She offers her skill to anyone who requests it, without concern for the requester's identity or intentions. As crime escalates in the area, her willingness to help puts her at risk of becoming entangled in dangerous situations.