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Drowning in a Dry Room [Part 3] The suspect turns out to be Kojiro. Takao explains that in the video of everyone discovering Daiki's body, Kojiro, a trained Cardiologist, failed to follow the proper steps to determine if Daiki was alive. She thus deduces he was actually removing illegal stimulant drugs from Daiki's pocket that Daiki had been paid by Kojiro to plant in Ryuichiro's office to ruin his reputation, allowing Kojiro to replace him as hospital Chairman. The police seize Kojiro and find the stimulants. Kojiro admits to everything except Daiki's murder. With no other suspect Sakurai still plans to arrest Seiji for Daiki's murder, meaning Yu's transfer will still be going ahead. While discussing the case Yu reminds Takao when Daiki attacked Seiji he didn't punch him, he head-butted him, causing her to instantly solve the case. She invites everyone involved back to Ryuichiro's office and reveals that by head-butting Seiji, Daiki had given himself a small Subarachnoid hemorrhage deep inside his brain. At first he had no symptoms, but after locking himself inside Ryuichiro's study to plant the stimulants for Kojiro the hemorrhage suddenly became worse and caused spontaneous Pulmonary edema, causing his lungs to fill with water from his own body. Having proof that Daiki accidentally caused his own death, Sakurai decides not to arrest Seiji. Yu's transfer is cancelled and he continues working with Takao, who hides how happy she is by jumping straight back into work, determined to tutor him for as long as it takes until he is as excellent a diagnostician as she is.