Though only in the sense that its the shortening of "Ibaraka-sen", not the first half of "Kasen Ibaraki".

maybe emi can share her rather silly memory about a wooden moon rocket

ArchVile: That would be a fun conversation. I'm planning for Katherine's thoughts about her "past self" to bleed through in her mini-event top-level, so many they could start the conversation with that?

I'm pretty sure Kasen would know about Yukari's moon invasion.