Rensou no Aria

Since her early years, Aria had no parents and was brought up by nuns in a makeshift "foster home." On her 16th birthday, she receives an unforeseen gift in the post - a ring from her "Daddy-long-legs," who had safeguarded her all through her upbringing. However, what appears to be an innocuous present initiates a sequence of events as Aria is promptly targeted, with her life endangered and kidnapping attempts. Although Canon rescues her, her supposed bodyguard, can he genuinely defend her against the hazards that await her?