Hyouka - Volume 03 - The Kudryavka Sequence - Welcome to KANYA FESTA! (1)

Oh yes, I came here in order to pay Oreki-san a visit. The Geology Room
door was closed, even though it's supposed to be left open for the whole day.
I knocked and opened the door.
Inside were Oreki-san, as well as Fukube-san, who raised his hand to greet
me,
"Hey, Chitanda-san. Irisu-sempai's managed to sell her copies quite well,
hasn't she?"
"Yes, she's asked for another 10 copies,"
I said while looking at Oreki-san, who seemed to be fervently reading some
anthology and didn't bother to lift his head. Could it be that he didn't notice
my presence? Noticing my gaze, Fukube-san shurugged his shoulders,
"He's reading a manga. And he seems pretty obsessed with it, since he's not
even listening to what I'm saying."
His eyes fixed on the book, Oreki-san spoke,
"I heard you. The thief had skipped [KU] altogether and went for the Light
Music Club, which began with [KE]."
"It's no use just listening if you don't get the importance of what's happening,
you know."
"Hang on, I'm about to get to the ending."
You see? Fukube-san gestured to me as he shrugged his shoulders again.
Upon thirty seconds after he told us to "hang on", Oreki-san finally closed the
manga he was reading and sighed deeply. Fukube-san began to tease him,
"Who would have thought Houtarou would be so immersed into a manga?
Maybe you should consider follow Mayaka as her disciple?"
What's the difference between these doujin manga and normal manga? I'm
not too familiar with such things......