Here is the weekly manga sales ranking for December 20th - 26th.

*1, 363,754 363,754 Saint Young Men vol.6
*2, 162,782 731,762 Nodame Cantabilev vol.25
*3, 132,738 132,738 Strobe Edge vol.10
*4, 124,833 287,032 Fairy Tail vol.24
*5, *92,647 *92,647 Uchuu Kyoudai vol.12
*6, *85,294 135,955 Tsukihime vol.10
*7, *83,333 176,328 Ace of Diamond vol.24
*8, *77,388 176,794 Hajime no Ippo vol.94
*9, *75,755 160,569 Major vol.78
10, *72,071 *72,071 Suki desu Suzuki-kun!! vol.10

11, *71,483 151,580 Kekkaishi vol.32
12, *64,945 *64,945 Higurashi no Naku Koro ni Kai Matsuribayashi-hen vol.6
13, *60,658 *60,658 Kanojo wa Uso wo Aishisugiteru vol.5
14, *50,539 104,605 Gakuen Alice vol.23
15, *48,825 330,072 Shingeki no Kyojin vol.3
16, *47,186 *47,186 Sekirei vol.11
17, *46,374 *46,374 Maihime Terepsikola Part 2 vol.5
18, *45,043 *45,043 Shinrei Tantei Yakumo vol.4
19, *44,820 *44,820 Zetsuen no Tempest vol.3
20, *44,498 *97,791 Area no Kishi vol.23

21, *43,398 *43,398 Mirai Nikki vol.11
22, *40,722 *97,825 Zettai Karen Children vol.24
23, *40,128 216,509 Chihayafuru vol.11
24, *39,723 *39,723 Mirai Nikki vol.6
25, *39,515 *39,515 Judge vol.2
26, *38,289 *38,289 Umineko no Naku Koro ni - Episode 2: Turn of the Golden Witch vol.5
27, *37,107 *37,107 Umineko no Naku Koro ni - Episode 3: Banquet of the Golden Witch vol.3
28, *36,556 *36,556 Umineko no Naku Koro ni - Episode 4: Alliance of the Golden Witch vol.3
29, *36,234 *76,755 Zetman vol.15
30, *36,084 *71,300 Real Clothes vol.11

Source: Oricon Manga Ranking

Weekly Light Novel Ranking for Dec 20 - 26
*1, 72,579 1,501,374 Moshidora
*2, 45,987 *,*45,987 Kabukimonogatari
*3, 37,310 *,*37,310 IS: Infinite Stratos vol.6
*4, 33,571 *,*33,571 Hidan no Aria vol.8
*5, 20,022 *,*45,421 Uchi no 3 Shimai vol.14
*6, 17,110 *,*17,110 Kuromajo-san no Valentine vol.13
*7, 16,325 *,*27,788 Dai Densetsu no Yuusha no Densetsu vol.9
*8, 15,438 *,*15,438 Bungaku Shoujo Short Stories vol.4
*9, 14,196 *,*14,196 Onii-chan dakedo Ai sae areba Kankei Naiyone
10, 12,125 *,*21,584 High School DxD vol.8
11, 10,188 *,*16,621 RPG World vol.7
12, 10,085 *,*17,478 Hyoketsu Kyokai no Eden vol.5
13, *8,994 *,*16,459 Tokyo Ravens vol.3

Source: Oricon Novel Ranking