On one rainy day, an Adapter attacks the passengers on a tram. Luckily, Aoto, another Adapter who was at the scene, stops him with his ability. Akane and Midori are ordered by the Academy to recruit Aoto, but they hear a disturbing rumor about him.

Concerned about Aoto's emotional disconnect, Akane and Midori look him up on the academy server, but his information were classified. Determined, the two steal Undine's access pass and finds out that Aoto is a suspect of the Blue Christmas massacre.