Here are the weekly manga and light novels rankings for December 26th - January 1st.

ranks/ this week's sales by copies/ cumulative sales/ titles
Manga
*1, 351,530 *,351,530 Kuroshitsuji vol.13
*2, 138,278 *,138,278 Suki desu Suzuki-kun!! vol.14
*3, *99,811 *,349,957 Thermae Romae vol.4
*4, *87,780 *,*87,780 Tomehane! vol.9
*5, *82,289 *,205,214 Ao Haru Ride vol.3
*6, *72,541 *,*72,864 Bokutachi wa Shitte Shimatta vol.13
*7, *62,140 *,*62,299 Himitsu No Ai-Chan vol.6
*8, *55,844 *,*56,606 Kaze Hikaru vol.31
*9, *55,343 *,408,333 Fairy Tail vol.30
10, *54,839 *,172,392 Uchuu Kyoudai vol.16

11, *54,081 *,137,810 Inu x Boku SS vol.6
12, *53,216 *,*75,691 07-Ghost vol.13
13, *49,304 *,*49,304 Himitsu vol.10
14, *43,668 *,*43,878 Piece vol.7
15, *42,940 *,127,655 Barakamon vol.5
16, *42,208 *,439,288 Detective Conan vol.74
17, *39,743 *,288,327 Toaru Kagaku no Railgun vol.7
18, *38,874 *,125,264 Genshiken vol.11
19, *38,542 *,584,980 Shingeki no Kyojin vol.6
20, *37,571 *,109,660 Lucky ☆ Star vol.9

21, *35,563 *,*35,563 Manga de Wakaru Shinryou Naika vol.5
22, *34,414 *,*85,617 Usotsuki Lily vol.6
23, *33,483 *,*33,483 Amagami - Precious Diary vol.4
24, *32,860 *,*32,860 Master Keaton vol.6 Complete Edition
25, *32,108 2,914,856 One Piece vol.64
26, *31,645 *,*84,499 Danshi Koukousei no Nichijou vol.5
27, *31,321 *,*31,321 Kare ja nai kedo
28, *30,897 *,206,799 Ace of Diamond vol.29
29, *30,499 *,*97,628 Boku wa Tomodachi ga Sukunai vol.4
30, *29,589 *,*29,589 Tetsuwan Birdy Evolution vol.10

Light Novels
*1, 90,407 106,908 Baka to Test to Shoukanjuu vol.10
*2, 36,915 177,238 Koimonogatari
*3, 29,302 314,111 Biblia Koshodo no Jikentecho vol.1
*4, 19,841 *42,987 Banno Kanteishi Q no Suirigeki vol.1
*5, 19,396 *84,698 Hidan no Aria vol.11
*6, 19,151 195,168 Biblia Koshodo no Jikentecho vol.2
*7, 14,586 *14,586 Hakushaku to Yousei vol.28
*8, 13,348 211,586 Toaru Majutsu no Index: New Testament vol.3
*9, 11,736 *14,753 Hikaru ga Chikyu ni Itakoro...... vol.3
10, 11,544 *65,005 Full Metal Panic! Another vol.2
11, *8,832 **8,832 Ore ga Heroine wo Tasukesugite Sekai ga Little Mokushiroku!? vol.3

Source: Oricon Youtaiju