Control — the Commonwealth's covert ops group — suspects a double agent within the Kingdom's royal family and dispatches Ange and the rest of "Team White Pigeon" to discover the truth.

While the funeral of the assassinated Prince Edward, who was the first in line to succeed the throne, is being held, the nobles of the Kingdom of Albion discuss topics such as whether the second-in-line Princess Mary or the third-in-line Duke of Arkham, Prince Richard, will succeed the throne, and how the Duke of Normandy will act.

After an attempt on King Richard’s life, assassins target Princess Mary, the next in line to the throne. Team White Pigeon must protect her while locating deadly Cavorite bombs — a tough feat when Ange is Princess Mary’s sister in disguise.

A year after losing her mother, a young girl learns that she must journey across Japan to the annual gathering of gods in the sacred land of Izumo.