After they met Dr Nikaido's lab partner Matsudo and ask for his help to create the antidote, Matsudo, who was initially reluctant due to a past incident of an accidental death as a result of his creations, finally relented and agreed to do the job after hearing L's persuasion. After several failed attempts, with the help of Near, the antidote was made. But by then, Maki sneaked off, intending to murder Kujo but was captured instead before L, having discovered her disappearance, could arrive on time to save her. L could only find her bag and teddy bear left abandoned at the harbour where Maki told Kujo to come meet her before her capture.