So I am started reading this manga and got to 100th chapter, all in all it's quite a good piece except it has usual misconception about situation in Russian Empire at that time.
First thing is, there were zero to none revolutionary movements on far east, as it was scarcely populated and mainly people were okay about their living, It's only after actions of White Russian movement (more specifically the kind of terror they've done, to this very day people living beyond Ural call the ugliest most annoying dogs as Kolchak, by the name of the leader of White Russain movement, under his banner thousands of farmers were slaughtered then they refused to part with their livestock and food, and just to make "peasants behave" (late russian aristocracy were kind of an arseholes)) and US military intervention. After that people started lean towards soviet ideas as possibility for peace, freedom, end of lawlessness and fair regime.
Second, nor White Russians, nor Bolsheviks were the thing before 1916, when White Russian started to slowly form, and 1917, when Bolsheviks reappear during October Revolution, they were pretty much a non entity before that, less than 15000 members, and most of them were imprisoned or in exile at the time of the manga.
If I were to write a fiction about revolutionary from far east who ended up in Japan, I would've think about an SR (Socialist Revolutionary) party member. They were quite the bastards and skilled terrorists, who managed to kill multiple officials of high standing, and even tried to take out Nicolas the Second couple of times, and after all that somehow managed to be represented in first russian constituted assembly by winning the elections. They were quite the guys, however it is quite hard to put them into preferred time frame as they were formed in 1904 or 1905, after Russo-Japanese war.
So yeah, all in all manga is very cool, yet author did not do his research of RE situation properly.