The guy deserves a special note. He tended towards Sonno-Joi as time went on, and was thus isolated by Kondou and Hijikata. He suddenly escaped fromthe Shinsengumi (perhaps because he couldn't take the pressure of doing things he didn't feel right and being isolated anymore?) in 1864 (or 65), which made him a traitor, only to be caught by Okita before he could go far enough. He was sentenced to commit seppuku,and died at 29. I understand from the novel that Okita faced some anguish here - Yamanami was one of the earliest members of Shinsengumi. Okita and the others had known him since their Shieikan days. Okita was in despair because he had a choice of letting Yamanami go, but he chose duty when it came to a choice between "duty" and "passion". And from we get a glimpse at how merciless Hijikata can be when it comes to punishments, for the sentence was imposed by him. The harsh sentence imposed on Yamanami invoked the other members' dissastisfaction, because Yamanami was a gentle, honest man, and many thought that Hijikata was being too harsh. This was also one of the factors which caused 15 members to pack up and go with Itou.