I like how we are able to tell that the original Miku is "grown" up in comparison to Rin and Len. Also the fact that she has her same personality as the "original" Miku, which is quite different from Chibi Miku.
I wonder what drink Rin gave Miku. It can't be the Negi Soda because they didn't know what it was until older Rin gave it to Chibi Miku as a failed attempt to make her drink something nasty.
... Maybe it's Negi Juice? :D
I would also like to note that people keep forgetting to add the |_| tag, which most of the Chibi Mikusan comics have. Tag added.
I'm trying to figure out what book she's reading. I can tell the katakana says "Carl Vinson", but the first three I think might be "字宙家" and the fourth I can't read. I think it's "家族". So Space Family Carl Vinson? Carl Vinson is a U.S. Representative who also had a naval ship named after him.