I translated this in a rough form, though I need a typesetter.

pg 1: "TS MONO: Health!" by nekomasu ("TS stuff: health!" by nekomasu)

pg 2:
Girl: So, that's what happened....
Haaah....
(Why did this happen...?)
Guy: I see....You are without a doubt Takashi.

panel 2: but, why did you dress like that?
Girl: It was my older sister.
Next bubble: (I hate it, why did she especially give me a skirt....)

Guy: ...By the way, what kind of underwear are you wearing?

Girl: If I wore boy stuff under the skirt wouldn't that be terrible?