Here is the weekly manga ranking for December 7th - 13th.

*1, 398,550 1,762,418 One Piece vol.56
*2, 162,299 *,638,210 Bleach vol.42
*3, 156,739 *,400,788 D.Gray-man vol.19
*4, 149,210 *,403,076 Katekyo Hitman Reborn! vol.27
*5, 115,047 *,905,264 Nodame Cantabile vol.23
*6, *77,385 *,*77,385 Hanma Baki vol.21
*7, *76,934 *,*76,934 Souten no Ken vol.21
*8, *72,522 *,162,419 Vampire Knight vol.11
*9, *70,790 *,*70,790 Chihayafuru vol.7
10, *64,699 *,167,067 Toriko vol.7

11, *63,699 *,173,336 Nurarihyon no Mago vol.8
12, *58,768 *,499,306 Kuroshitsuji vol.8
13, *42,419 *,*96,163 Naruto Official Premium Fan Book
14, *42,225 *,464,260 REAL vol.9
15, *39,000 *,447,181 Yotsuba&! vol.9
16, *38,396 *,*93,014 Ane Doki! vol.1
17, *37,321 *,*96,548 Kure-nai vol.4
18, *27,947 *,82,141 Medaka Box vol.2
19, *26,328 *,*53,970 Higanjima vol.29
20, *25,932 *,*25,932 Mitsudomoe vol.8

21, *25,106 *,*25,106 Papillon - Hana to Chou vol.8
22, *24,849 *,*24,849 Saint Seiya Lost Canvas vol.17
23, *24,519 *,*24,519 Heart no Kuni no Alice ~ Wonderful Wonder World ~ vol.4
24, *24,192 *,512,611 Detective Conan vol.66
25, *23,427 *,*23,427 Triage X vol.1
26, *23,213 1,865,327 One Piece vol.55
27, *22,099 *,*22,099 Gokuraku Seishun Hockey Club vol.14
28, *20,926 1,087,620 Naruto vol.48
29, *19,641 *,*19,641 Kamen no Maid Guy vol.11
30, *19,176 *,*19,176 Monochrome Factor vol.8

Additional news:
According to Iza news, all the 56 volumes of One Piece manga ranked within the top 200 of Oricon weekly manga ranking.

Sources: Oricon Manga Ranking, Iza News
Japan's Weekly Manga Ranking for Nov 30 - Dec 6

Weekly Light Novel Ranking for Dec 7 - 13
*1, 41,766 *41,766 Sword Art Online vol.3
*2, 39,821 *39,821 Nogizaka Haruka no Himitsu vol.11
*3, 32,343 *32,343 Guin Saga vol.130
*4, 20,245 *20,245 Boogiepop vol.16
*5, 18,694 138,609 Saiunkoku Monogatari vol.15
*6, 16,303 *16,303 Lucky Chance! vol.6
*7, 12,006 *12,006 Westadia no Sosei vol.6
*8, 11,055 *11,055 Tarot no Goshujin-sama. vol.8
*9, *9,725 **9,725 Gunparade March vol.21

Source: Oricon Novel Ranking