Canonically, Fukuzawa is still not over the guilt of his old job as a government assassin. In the 3rd official guidebook he says:

𝗪𝗵𝗮𝘁 𝗱𝗼 𝘆𝗼𝘂 𝘄𝗮𝗻𝘁 𝘁𝗼 𝗼𝘃𝗲𝗿𝗰𝗼𝗺𝗲?
"The mistakes I made in the past as an assassin."