Joining forces with Alice, Iska and his team quash the Empire and the Sovereignty's conspiracy and successfully protect Sisbell. After the ordeal, they travel to Alsamira to enjoy their vacation. However, Sisbell has not returned to the palace yet, and asks Unit N07 on vacation to escort her back, offering something they can’t refuse. Meanwhile, Alice gets a gut feeling that Sisbell's new bodyguard might be Iska...

Iska and Alice suddenly meet again at the Riesbaden station. Alice then learns that he is the bodyguard for her sister Sisbell. Meanwhile, a major incident occurs in the central province.

The suspect who attempted the assassination may target Sisbell next, since she hosts an astral spirit with the ability to reenact the past and identify the suspect. Unit N07 goes on high alert and is left with no other option but to hide at a hotel and wait for an audience with Mirabella. However, a large explosion occurs near the hotel. When Sisbell tries to reenact what really happened, someone with the same "shadow" from the reenactment starts to attack her.

Alice is back in the central province and reports to her mother about Sisbell's whereabouts. Sisbell herself also returns to the central province a short time later. However, upon her arrival, there is a surprising encounter.

Invited by Elletear, Iska and his team visit the Erz palace, a vacation house owned by the House of Lou. Wary of her sister, Sisbell brings Iska along to sweep the palace for bugs. Iska is very nervous when she decides to sweep Alice’s bedroom as well. Meanwhile, Alice hurries her way to the Erz palace to stop Sisbell from discovering her forbidden secret. When the three princesses come together, Iska may find himself between a rock and a hard place...!

With news of the attack, Alice returns to the Queen's palace. Later they are attacked by an unknown enemy.