Any good 12 episode anime?

I've got a couple (I was surprised how many anime have 24 episodes...)

Coppelion (technically 13 episodes)
Death Parade
K
Kids on the Slope
The Devil is a Part-Timer! (13 episodes)
Btooom!!
Tsuritama
ángel Beats! (13 episodes)

One puñetazo, ponche Man


it has only 12 episodes now....i repeat now....in future there might be 2nd o 3rd seasons for this im sure........he he he he h

K Return Of Kings
i gurantee its a great anime....i loved it!

Chivalry of a Failed Knight

No game No life

Rokka: Braves of the six flowers
K/K Project
K: Return of Kings(second season of K/K Project)
K: Missing Kings(Movie of before K: Return of King)
Mekakucity Actors/Kageou Project/Kagerou Daze
charlotte (13)
The Asterisk War
Problem Children Are Coming From Another World Aren't They? (10)

Uta no prince sama.There are actually 3 seasons so far.

Gangsta is a really good short anime in my opinion.

Honorable mentions:
Midori no Hibi
Baccano! (though it's 16 episodes)
Tsuritama
Usagi Drop
Bartender
Barakamon