Baka to Test no Benkyoukai. 2

Notes
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Kuu (cool), Dere, Tsun -
Japanese terms used to describe characters.
Usual stereotypes include tsundere and kuudere.
Kuu would be rarely showing emotions, keeping a cool head.
Tsun would be having a cold attitude, a quick temper, etc.
Dere would be essentially the opposite of that, a soft and fluffy personality.
The contradictory personalities give them more appeal, also known as "gap moe".

Anime Colouring -
A style of colouring.
A simple range of colours are used, something often seen in traditional cel animation.

K-on! Episode Title -
Each episode of K-on! starts with a cassette tape with the episode's title labelled onto it, accompanied by a guitar riff.

Dengeki Bunko -
A publishing label specialising in light novels aimed at the male demographic.
Include titles such as Shakugan no Shana, To Aru Majutsu no Index or Ore no Imouto ga Konnani Kawaii wake ga nai.

Circle cut -
A circle refers to a group.
A circle cut refers to that rectangular box, a template used to advertise in doujin event catalogs.

Bishoujo-sensei -
Inoue Kenji's nickname.
A nickname adapted by users of japanese BakaTest discussion boards, when they found an online column by Taguchi Sennendou that commented that an author with the penname of "Inoue Kenjiko 13 y/o female" called him an "idiot".
"ko" at the end of names is usually used for female names. As a result... Well, should be pretty obvious.
Also promoted by Bishoujo-sensei's light novel author friends on their blog as they tease him.

Light novel -
A style of Japanese novels targetting the youth.
Usually shorter than usual novels, with a lighter writing style as well.