Buso Renkin

Kazuki Muto's heart is replaced with an alchemical alloy after he is killed by a homunculus while trying to save a girl.

Tokiko and Kazuki investigate the haunted factory and find a homunculus incubator.

Kazuki begins training with his lance; Tokiko and Kazuki search for the creator of the homunculus; the Papillon Masked Creator sends one of his subordinates after Kazuki.

Kazuki and Tokiko capture the creator of the homunculi, third-year student Koshaku Chono; Chono explains that he created the homunculi in an attempt to attain an immortal body by becoming a humanoid homunculus.

Kazuki and Tokiko fall back from Washio's attack in order to form a plan; Kazuki must face Washio by himself after Tokiko is injured; Washio asks Kazuki why he fights.

Kazuki heads to Chono's house in search of the antidote; Koshaku's brother Jiro destroys the flask holding the homunculus; Koshaku is reborn as the humanoid homunculus Papillon.