If I Hadn't Met you (あなたに出会わなければ)

shortly after the Shinsengumi left Edo, Hijikata started noticing something changing in him. he was sleepless and he was haunted by the image of someone who he "hated". he had changed, he feel incomplete, but why? the answer was in a piece of paper given to him by Kondo Isao. (contain spoiler from the farewell shinsengumi arc )