(spoiler)
Although his doctor never tells him the truth, Naruse Jun'ichi (played by Kamiki Ryu'unosuke) knows there is someone else in him. He is very different from before. He is now sensitive to sound/noises and snaps to get violent. He gets in a fight and almost kills a person. He's colder and more distant to his girlfriend, Hamura Megumi (played by Nikaidou Fumi).
Trying to find the brain donor, Jun'ichi and Megumi go to meet the father of a person who had a car accident on the night Jun'ichi was shot and died in the same hospital. The father tell them how gentle and caring his son was. Jun'ichi doesn't feel any connection and thinks this person was not the donor.
Megumi insists that it doesn't matter who the donor was. She just wants to go back to the quiet life with him like before. Not being able to be a person like before, Jun'ichi kicks her out of his apartment.
One of the doctors in the team suggests Megumi to break up with him that her existence gives Jun'ichi pressure to be a person like before.
Jun'ichi starts to think he received a brain from his killer, Kyougoku Shunsuke (played by Watabe Gouta). Kyougoku wanted to be a musician and as everyone knows, he was very violent. Jun'ichi goes to see the place Kyougoku lived. There he meets Kyougoku's twin sister (played by Honda Tsubasa). He immediately has a bad headache and feels the connection. A vision of a red piano comes to his head.
Jun'ichi is scared as he knows he's losing himself little by little and becoming more and more like Kyougoku. He is afraid his mind/brain will be taken over by Kyougoku.
A police detective, Kurata Kenzou (played by Murakami Jun) has been unofficially after this case, checking on Jun'ichi's doctor, Jun'ichi and Megumi. He heard about the brain transplant from Megumi.
