And sure, she may not be explicitly stating any concern here, but it's implied in her words all the same. That she - at least to some extent - cares about Natsuno's wellbeing. It sounds like he's been through a lot back home, after all, and he's not a bad guy at all. He shouldn't suffer here, at the very least.
"I'm not quite sure if we can always trust the train to keep supplying blood like that, after all. What if it suddenly stops one day?"
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And sure, she may not be explicitly stating any concern here, but it's implied in her words all the same. That she - at least to some extent - cares about Natsuno's wellbeing. It sounds like he's been through a lot back home, after all, and he's not a bad guy at all. He shouldn't suffer here, at the very least.
"I'm not quite sure if we can always trust the train to keep supplying blood like that, after all. What if it suddenly stops one day?"