Thank you for posting that actual convo. That wasn't the one that was weird to me, but yeah, there's quite a bit of evidence that Koichi had been there before.
And, sorry about that. I get now what you mean exactly. For me, to hear the exact same opening (memory bad, just saying) "Hey! I'm in India right now!" He said it like it was the first time saying it. It was just odd to me.
And, stuff about Akuzawa is also odd to me. Course, we have the art boy, who gets generally passed over all the time and somehow lives. There's also that possibility that I think some others on here have thought about.
And I think that previous years, to an extent are kept in tact. I don't think that the whole system and observations that the librarian has made are all made up by the memory altering thing.
The next episode will drastically change the theories of one of us though.