The book is from the perspective of a child at the start who is against the restoration and who's clan is brutally suppressed as a result, he and his surviving family are sent north to starve and freeze, but he eventually becomes a page(?) in Tokyo who joins the new imperial army eventually attacking the revolting clan that destroyed his childhood.
I believe it to be an autobiography and have given as much detail as I can remember. Any help would be appreciated.
(also unclear if this breaks the rules of the sub or not, but figured this would be more likely to answer my question than /r/askhistory or /r/books)
It sounds like an autobiography of Lt. Colonel Goro SHIBA, though the last part of the narrative can be a bit different.
The autobiography is well-known one among the Japanese and titled as 'Aru Meiji jin no Kiroku: Aizu jin Shiba Goro no Isho (in Japanese)', can be roughly translated title in English as following: 'A memorandum of a man in Meiji Era: Teaching of Goro SHIBA of Aizu on death', just updated to the revised edition in 2017.
I've also found the English translation of the autobiography, and assume that you've read this one. Is my assumption correct?
+++
[Added]: Colonel Goro SHIBA was one of the very few figures among the military officers during Japanese Empire period (1868-1945) in regard with his origin: He came from ex-Samurai estate of Aizu domain, one of the most fierce insurgents against the Meiji Restoration due to the domain lord's linage (branch of Tokugawa-Matsudaira shogunate family), while the majority of Imperial army and navy were still predominantly occupied by those who from ex-Choshu as well as ex-Satsuma domains, main stream of the Restoration Army. So, his restospetive of his own childhood during the early years of Meiji period is said to be a bit different from the more major, triumphant view of Restoration.
Colonel Shiba was also famous for his involvement first with First Sino-Japanese War (1894-1895), and then, especially with the Boxer Rebellion/ Yihetuan Movement (1899-1901) in the twilight of Qing dynasty in China as a military attaché at the Japanese legation. He also wrote his eyewitness account on the latter incident, whose title can be roughly translated as 'Peking Siege'. though I'm not sure whether this account has been also translated in English.
+++
Sorry for not citing any academic reference either to Colonel Shiba or to the prosopograhy of the military officers during Imperial Period of Japan in English above (since I'm not expert in this area/ period, especially in Anglophone historiography).