Captain Bravo, a member of the Alchemist Warriors and the one who delivered the cure to Tokiko, offers Kazuki to join their mission on combating against the LXE, a group consisting of Human-type Homunculi based in Kazuki's town. Koushaku, having been resurrected by the LXE's leader who is also his great-great grandfather, Dr. Butterfly, and now calling himself Papillon, seeks Kazuki and declares war on him. Kazuki, Tokiko and Bravo are then attacked by Kinjo, a Homunculus of the LXE, but he is quickly dispatched by Bravo.

During the night, Bravo takes Kazuki out to the woods for special training while Tokiko protects the kakugane acquired from the previous battle. Later on, a Homunculus named Jinnai uses a buso renkin and takes control over the students in the dorm, ordering them to take the kakugane from Tokiko. Tokiko is able to avoid her classmates and kill Jinnai, freeing them from his control. Papillon takes the kakugane from the defeated Homunculus, declares that he will defeat Kazuki and then leaves the scene.